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The Mississippi River is the second-longest river and chief
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

river
of the second-largest drainage system on the North American continent, second only to the
Hudson Bay Hudson Bay ( iu, text=ᑲᖏᖅᓱᐊᓗᒃ ᐃᓗᐊ, translit=Kangiqsualuk ilua or iu, text=ᑕᓯᐅᔭᕐᔪᐊᖅ, translit=Tasiujarjuaq; french: baie d'Hudson), sometimes called Hudson's Bay (usually historically), is a large body of sal ...
drainage system. From its traditional source of
Lake Itasca Lake Itasca is a small glacial lake, approximately in area. Located in southeastern Clearwater County, in the Headwaters area of north central Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. ...

Lake Itasca
in northern
Minnesota Minnesota () is a U.S. state, state in the Upper Midwest, upper Midwestern United States. It is the List of U.S. states and territories by area, 12th largest U.S. state in area and the List of U.S. states and territories by population, 22nd m ...

Minnesota
, it flows generally south for to the
Mississippi River Delta The Mississippi River Delta is the confluence of the Mississippi River with the Gulf of Mexico in Louisiana, southeastern United States. The river delta is a area of land that stretches from Vermilion Bay (Louisiana), Vermilion Bay on the wes ...
in the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin 400px, Diagrammatic cross-section of an ocean basin, showing the various geographic features In hydrology Hydrology (from Greek: wikt:ὕδωρ, ὕδωρ, "hýdōr" meaning ...

Gulf of Mexico
. With its many
tributaries A tributary, or affluent, is a stream A stream is a body of water with surface water flowing within the stream bed, bed and Bank (geography), banks of a Channel (geography), channel. The flow of a stream is controlled by three inputs – ...
, the Mississippi's
watershed Watershed is a hydrological term, which has been adopted in other fields in a more or less figurative sense. It may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins ** European watershed * Drainage basin, ...

watershed
drains all or parts of 32
U.S. state In the , a state is a , of which there are currently 50. Bound together in a , each state holds al jurisdiction over a separate and defined geographic territory where it shares its with the . Due to this shared sovereignty, are both of t ...
s and two
Canadian provinces The provinces and territories of Canada are sub-national divisions within the geographical areas of Canada under the jurisdiction of the Constitution of Canada, Canadian Constitution. In the 1867 Canadian Confederation, three provinces of Britis ...
between the
Rocky ''Rocky'' is a 1976 American sports drama film A sports film is a film genre that uses sport as the theme (arts), theme of the film. It is a production in which a sport, sporting event, athlete (and their sport), or follower of sport (and the ...

Rocky
and
AppalachianAppalachian may refer to: * The Appalachian Mountains, a major mountain range in eastern United States and Canada * The Appalachian Trail, a hiking trail in the eastern United States * The people of Appalachia and their culture ** Appalachian Americ ...

Appalachian
mountains. The
main stem In hydrology Hydrology (from Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, is a country located in Southeast Europe. Its population is approxi ...
is entirely within the United States; the total
drainage basin A drainage basin is any area of land where precipitation In meteorology Meteorology is a branch of the atmospheric sciences Atmospheric science is the study of the Earth's atmosphere File:Atmosphere gas proportions.svg, Compos ...

drainage basin
is , of which only about one percent is in Canada. The Mississippi ranks as the fourteenth-largest river by discharge in the world. The river either borders or passes through the states of
Minnesota Minnesota () is a U.S. state, state in the Upper Midwest, upper Midwestern United States. It is the List of U.S. states and territories by area, 12th largest U.S. state in area and the List of U.S. states and territories by population, 22nd m ...

Minnesota
,
Wisconsin Wisconsin () is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper ...

Wisconsin
,
Iowa Iowa () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wiscon ...

Iowa
,
Illinois Illinois ( ) is a in the region of the . Of the fifty U.S. states, it has the , population, and the . is the state's largest city and the fifth with the capital in , located in the center of the state; other major metropolitan areas in ...

Illinois
,
Missouri Missouri is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper in ...

Missouri
,
Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ...
,
Tennessee Tennessee (, ), officially the State of Tennessee, is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The S ...

Tennessee
,
Arkansas Arkansas () is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper ...

Arkansas
,
Mississippi Mississippi () is a in the region of the , bordered to the north by ; to the east by ; to the south by the ; to the southwest by ; and to the northwest by . Mississippi's western boundary is largely defined by the . Mississippi is the and ...
, and
Louisiana Louisiana (Standard French Standard French (in French: ''le français standard'', ''le français normé'', ''le français neutre'' eutral Frenchor ''le français international'' nternational French is an unofficial term for a standard ...

Louisiana
.
Native Americans Native Americans may refer to: Ethnic groups * Indigenous peoples of the Americas, the pre-Columbian peoples of North and South America and their descendants * Native Americans in the United States * Indigenous peoples in Canada, the indigenous p ...
have lived along the Mississippi River and its tributaries for thousands of years. Most were
hunter-gatherer A hunter-gatherer is a human Humans (''Homo sapiens'') are the most populous and widespread species of primates, characterized by bipedality, opposable thumbs, hairlessness, and intelligence allowing the use of culture, language and tools. T ...
s, but some, such as the
Mound Builders A number of pre-Columbian cultures are collectively termed "Mound Builders". The term does not refer to a specific people or archaeological culture, but refers to the characteristic mound A mound is a heaped pile of earth, gravel, sand, ...
, formed prolific agricultural and urban civilizations. The arrival of Europeans in the 16th century changed the native way of life as first explorers, then settlers, ventured into the basin in increasing numbers. The river served first as a barrier, forming borders for
New Spain New Spain, officially the Viceroyalty of New Spain ( es, Virreinato de Nueva España, ), or Kingdom of New Spain, was an integral territorial entity of the Spanish Empire The Spanish Empire ( es, link=no, Imperio Español), also known as th ...

New Spain
,
New France New France (french: Nouvelle-France) was the area colonized by France France (), officially the French Republic (french: link=no, République française), is a spanning and in the and the , and s. Its extends from the to the a ...

New France
, and the early United States, and then as a vital transportation artery and communications link. In the 19th century, during the height of the ideology of
manifest destiny Manifest destiny was a widely held cultural belief in the 19th century in the United States, 19th-century United States that American settlers were destined to expand across North America. There are three basic themes to manifest destiny: * T ...

manifest destiny
, the Mississippi and several western tributaries, most notably the
Missouri Missouri is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper in ...
, formed pathways for the western expansion of the United States. Formed from thick layers of the river's
silt Silt is granular material A granular material is a conglomeration of discrete solid, macroscopic scale, macroscopic particles characterized by a loss of energy whenever the particles interact (the most common example would be friction when gra ...
deposits, the
Mississippi embayment The Mississippi Embayment is a physiographic feature in the south-central United States The United States of America (USA), commonly known as the United States (U.S. or US), or America, is a country Contiguous United States, primarily l ...
is one of the most fertile regions of the United States;
steamboats upright=1.35, Dutch river steam-tugboat ''Mascotte II'' A steamboat is a boat that is propelled primarily by steam power, typically driving propellers or paddlewheels. Steamboats sometimes use the prefix designation SS, S.S. or S/S (for 'Sc ...
were widely used in the 19th and early 20th centuries to ship agricultural and industrial goods. During the
American Civil War The American Civil War (also known by Names of the American Civil War, other names) was a civil war in the United States from 1861 to 1865, fought between northern U.S. state, states loyal to the Union (American Civil War), Union and sout ...
, the Mississippi's capture by Union forces marked a turning point towards victory, due to the river's strategic importance to the
Confederate Confederacy may refer to: A confederation, an association of sovereign states or communities. Examples include: * Battle of the Trench, Confederate tribes * Confederate States of America, a confederation of secessionist American states that existed ...

Confederate
war effort. Because of the substantial growth of cities and the larger ships and
barge A barge is a - , built mainly for and transport of bulk goods. Originally barges were towed by draft horses on an adjacent . Barges have changed throughout time. From 1967-1983 barges were considered a flat bottom boat that was nineteen feet ...

barge
s that replaced steamboats, the first decades of the 20th century saw the construction of massive engineering works such as
levee file:River Levee Cross Section Figure.svg, Components of a levee: file:Sacramento River Levee.jpg, The side of a levee in Sacramento, California A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop ...

levee
s,
locks Lock may refer to: *Lock and key, a mechanical device used to secure items of importance. *Lock (water navigation), a device for boats to transit between different levels of water Arts, entertainment, and media *Lock (film), ''Lock'' (film), a ...
and
dam A dam is a barrier that stops or restricts the flow of surface water An example of surface water is Lake Kinney. Surface water is water Water is an Inorganic compound, inorganic, Transparency and translucency, transparent, tast ...

dam
s, often built in combination. A major focus of this work has been to prevent the lower Mississippi from shifting into the channel of the
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
and bypassing
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
. Since the 20th century, the Mississippi River has also experienced major pollution and environmental problems – most notably elevated nutrient and chemical levels from agricultural runoff, the primary contributor to the Gulf of Mexico dead zone.


Name and significance

The word Mississippi itself comes from , the French rendering of the
Anishinaabe The Anishinaabe are a group of culturally related Indigenous peoples resident in what are now called Canada and the United States. They include the Odawa, Saulteaux, Ojibwe (including Mississaugas), Potawatomi people, Potawatomi, Oji-Cree, and ...
(
Ojibwe The Ojibwe, Ojibwa, Chippewa, or Saulteaux are an Anishinaabe The Anishinaabe are a group of culturally related Indigenous peoples resident in what are now called Canada and the United States. They include the Odawa, Saulteaux, Ojibwe (inc ...
or
Algonquin Algonquin or Algonquian—and the variation Algonki(a)n—may refer to: Indigenous peoples *Algonquian languages, a large subfamily of Native American languages in a wide swath of eastern North America from Canada to Virginia **Algonquin languag ...
) name for the river, (Great River). In the 18th century, the river was the primary western boundary of the young United States, and since the country's expansion westward, the Mississippi River has been widely considered a convenient, if approximate, dividing line between the Eastern, Southern, and Midwestern United States, and the Western United States. This is exemplified by the
Gateway Arch The Gateway Arch is a monument in St. Louis, Missouri, United States. Clad in stainless steel and built in the form of a weighted catenary Catenary arch, arch, it is the world's tallest arch and List of tallest buildings in Missouri, Missouri's ...

Gateway Arch
in St. Louis and the phrase "
Trans-Mississippi Trans-Mississippi was a common name of the geographic area west of the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drai ...
" as used in the name of the
Trans-Mississippi Exposition The Trans-Mississippi and International Exposition was a world's fair held in Omaha, Nebraska Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County, Nebraska, Douglas County. Omaha is in the Midweste ...
. It is common to qualify a regionally superlative landmark in relation to it, such as "the " or "the oldest city west of the Mississippi". The
FCC The Federal Communications Commission (FCC) is an independent agency A regulatory agency or regulatory authority, is a Public benefit corporation Public-benefit corporation is a term that has different meanings in different jurisdictions. In ...
also uses it as the dividing line for broadcast call-signs, which begin with W to the east and K to the west, mixing together in
media market A media market, broadcast market, media region, designated market area (DMA), television market area, or simply market is a region where the population Population typically refers the number of people in a single area whether it be a city ...
s along the river.


Divisions

The Mississippi River can be divided into three sections: the
Upper Mississippi The Upper Mississippi River is the portion of the Mississippi River upstream of St. Louis, Missouri, United States, at the confluence of its main tributary, the Missouri River. History In terms of geologic and hydrographic history, the Upper Mi ...
, the river from its headwaters to the confluence with the Missouri River; the Middle Mississippi, which is downriver from the Missouri to the Ohio River; and the Lower Mississippi, which flows from the Ohio to the Gulf of Mexico.


Upper Mississippi

The Upper Mississippi runs from its headwaters to its confluence with the Missouri River at St. Louis, Missouri. It is divided into two sections: # The headwaters, from the source to
Saint Anthony Falls Saint Anthony Falls, or the Falls of Saint Anthony, northeast of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Upper Mississippi River. The natural falls were replaced by a concrete overflow spillway (also called an "a ...
in
Minneapolis, Minnesota Minneapolis () is a city in the of . With a population of 429,954 as of , it is the most populous city in the state and the 46th most populous in the nation. The of , Minneapolis lies along both banks of the , just north of its confluence wit ...

Minneapolis, Minnesota
; and # A navigable channel, formed by a series of man-made lakes between Minneapolis and St. Louis, Missouri, some . The source of the Upper Mississippi branch is traditionally accepted as
Lake Itasca Lake Itasca is a small glacial lake, approximately in area. Located in southeastern Clearwater County, in the Headwaters area of north central Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. ...

Lake Itasca
, above sea level in
Itasca State Park Itasca State Park is a state park of Minnesota, United States, and contains the headwaters of the Mississippi River. The park spans of northern Minnesota, and is located about north of Park Rapids, Minnesota and from Bagley, Minnesota. The park ...
in
Clearwater County, Minnesota Clearwater County is a County (United States), county in the northwestern part of the U.S. state of Minnesota. As of the 2010 United States Census, the population was 8,695. Its county seat is Bagley, Minnesota, Bagley. Clearwater County is hom ...
. The name ''Itasca'' was chosen to designate the "true head" of the Mississippi River as a combination of the last four letters of the Latin word for truth () and the first two letters of the Latin word for head (). However, the lake is in turn fed by a number of smaller streams. From its origin at Lake Itasca to
St. Louis, Missouri St. Louis () is the second-largest city in Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. With more than six million residents, it is the List of U.S. states and territor ...

St. Louis, Missouri
, the waterway's flow is moderated by 43 dams. Fourteen of these dams are located above Minneapolis in the
headwater 270px, FarringdonFarringdon may refer to: People * Nicholas de Farndone, 14th century Mayor of London Places London * Farringdon, London, an area of Clerkenwell which takes its name from ''Farringdon Station''. * Farringdon Road, a road in C ...
s region and serve multiple purposes, including power generation and recreation. The remaining 29 dams, beginning in downtown Minneapolis, all contain locks and were constructed to improve commercial navigation of the upper river. Taken as a whole, these 43 dams significantly shape the geography and influence the ecology of the upper river. Beginning just below
Saint Paul, Minnesota Saint Paul (abbreviated St. Paul) is the List of capitals in the United States, capital of the U.S. state of Minnesota and the county seat of Ramsey County, Minnesota, Ramsey County. Historically a major railroad and commercial center for the Up ...
, and continuing throughout the upper and lower river, the Mississippi is further controlled by thousands of Wing Dikes that moderate the river's flow in order to maintain an open navigation channel and prevent the river from eroding its banks. The
head of navigation Head of navigation is the farthest point above the mouth of a river that can be navigated by ship A ship is a large watercraft that travels the world's oceans and other sufficiently deep Sea lane, waterways, carrying goods or passengers, or i ...
on the Mississippi is the Coon Rapids Dam in
Coon Rapids, Minnesota Coon Rapids is a northern suburb of Minneapolis Minneapolis () is the most populous city in the US state of Minnesota and the seat of Hennepin County, Minnesota, Hennepin County. With an estimated population of 429,606 as of 2019, it is the Li ...
. Before it was built in 1913, steamboats could occasionally go upstream as far as
Saint Cloud, Minnesota St. Cloud is a city in the U.S. state of Minnesota and the largest population center in the state's Central Minnesota, central region. Its population is 68,462 according to the 2019 US census estimates, making it Minnesota's tenth largest cit ...
, depending on river conditions. The uppermost lock and dam on the Upper Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is . Below the dam, the river's elevation is . This drop is the largest of all the Mississippi River locks and dams. The origin of the dramatic drop is a waterfall preserved adjacent to the lock under an apron of concrete.
Saint Anthony Falls Saint Anthony Falls, or the Falls of Saint Anthony, northeast of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Upper Mississippi River. The natural falls were replaced by a concrete overflow spillway (also called an "a ...
is the only true waterfall on the entire Mississippi River. The water elevation continues to drop steeply as it passes through the
gorge A canyon (; archaic British English spelling: ''cañon'') or gorge is a deep cleft between escarpments or cliffs resulting from weathering and the erosion, erosive activity of a river over Geologic time scale, geologic time scales. Rivers have a ...
carved by the waterfall. After the completion of the St. Anthony Falls Lock and Dam in 1963, the river's head of navigation moved upstream, to the
Coon Rapids Dam Coon Rapids is a northern suburb of Minneapolis, and is the largest city in Anoka County, Minnesota, Anoka County, Minnesota, United States. The population was 61,476 at the 2010 United States Census, 2010 census, making it the List of cities in ...
. However, the Locks were closed in 2015 to control the spread of invasive
Asian carp Several species In biology, a species is the basic unit of biological classification, classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms i ...
, making Minneapolis once again the site of the head of navigation of the river. The Upper Mississippi has a number of natural and artificial lakes, with its widest point being
Lake Winnibigoshish Lake Winnibigoshish is a body of water in north central Minnesota, in the Chippewa National Forest. Its name comes from the Ojibwe language ''Wiinibiigoonzhish'', a diminutive and pejorative form of ''Wiinibiig'', meaning "filthy water" (i.e., "bra ...
, near
Grand Rapids, Minnesota Grand Rapids is a city in and the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public admin ...
, over across.
Lake Onalaska Lake Onalaska is a reservoir located on the Black River (Wisconsin), Black River and Mississippi River between Wisconsin, and Minnesota. It is approximately across, and is the widest point on the Mississippi River. Located in La Crosse County, Wis ...
, created by Lock and Dam No. 7, near
La Crosse, Wisconsin La Crosse is a city in the U.S. state of Wisconsin and the county seat of La Crosse County, Wisconsin, La Crosse County. Positioned alongside the Mississippi River, La Crosse is the largest city on Wisconsin's western border. La Crosse's populatio ...
, is more than wide.
Lake Pepin Lake Pepin is a naturally occurring lake on the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorpholo ...
, a natural lake formed behind the delta of the Chippewa River of Wisconsin as it enters the Upper Mississippi, is more than wide. By the time the Upper Mississippi reaches
Saint Paul Paul the Apostle,; el, Παῦλος, translit=Paulos; cop, ⲡⲁⲩⲗⲟⲥ; he, פאולוס השליח; – AD commonly known as Saint Paul and also known by his Hebrew name Saul of Tarsus,; ar, بولس الطرسوسي; el, ...
, Minnesota, below Lock and Dam No. 1, it has dropped more than half its original elevation and is above sea level. From St. Paul to St. Louis, Missouri, the river elevation falls much more slowly and is controlled and managed as a series of pools created by 26 locks and dams. The Upper Mississippi River is joined by the
Minnesota River The Minnesota River ( dak, Mnísota Wakpá) is a tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tribut ...

Minnesota River
at
Fort Snelling Fort Snelling is a former military fortification and National Historic Landmark in the U.S. state of Minnesota on the bluffs overlooking the confluence of the Minnesota River, Minnesota and Mississippi River, Mississippi rivers. The military site ...

Fort Snelling
in the
Twin Cities 300px, A view of the town of Tornio (Finland), which forms a twin city with Haparanda">Finland.html" ;"title="Tornio (Finland">Tornio (Finland), which forms a twin city with Haparanda (Sweden). Twin cities are a special case of two neighborin ...
; the St. Croix River near Prescott, Wisconsin; the Cannon River near
Red Wing, Minnesota Red Wing is a city in Goodhue County, Minnesota, Goodhue County, Minnesota, United States, along the upper Mississippi River. The population was 16,459 at the 2010 United States Census, 2010 census. It is the county seat of Goodhue County. Red ...

Red Wing, Minnesota
; the
Zumbro River Ice on the Zumbro in March The Zumbro River is a tributary of the Mississippi River in the Driftless Area of southeastern Minnesota in the United States. It is longU.S. Geological Survey. National Hydrography Dataset high-resolution flowline dat ...
at
Wabasha, Minnesota Wabasha is a city in Wabasha County, Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. It is known as the "Land of 10,000 Lakes". Its official motto is , French for "The Star of the North". Of t ...
; the
Black Black is a color which results from the absence or complete absorption Absorption may refer to: Chemistry and biology *Absorption (chemistry), diffusion of particles of gas or liquid into liquid or solid materials *Absorption (skin), a rout ...
, La Crosse, and
Root In vascular plant Vascular plants (from Latin ''vasculum'': duct), also known as Tracheophyta (the tracheophytes , from Greek τραχεῖα ἀρτηρία ''trācheia artēria'' 'windpipe' + φυτά ''phutá'' 'plants'), form a large grou ...
rivers in
La Crosse, Wisconsin La Crosse is a city in the U.S. state of Wisconsin and the county seat of La Crosse County, Wisconsin, La Crosse County. Positioned alongside the Mississippi River, La Crosse is the largest city on Wisconsin's western border. La Crosse's populatio ...
; the
Wisconsin River The Wisconsin River is a tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main s ...

Wisconsin River
at
Prairie du Chien, Wisconsin Prairie du Chien () is a city in and the county seat of Crawford County, Wisconsin, Crawford County, Wisconsin, United States. The population was 5,911 at the 2010 census. Its ZIP Code is 53821. Often referred to as Wisconsin's second oldest cit ...
; the Rock River at the
Quad Cities The Quad Cities is a region of cities (originally four, see History History (from Greek#REDIRECT Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, ...

Quad Cities
; the
Iowa River The Iowa River is a tributary A tributary, or affluent, is a stream A stream is a body of water (Lysefjord) in Norway Norway, officially the Kingdom of Norway,Names in the official and recognised languages: Bokmål Bokm ...

Iowa River
near
Wapello, Iowa Wapello is a city in and the county seat of Louisa County, Iowa, Louisa County, Iowa, United States. The population was 2,067 at the 2010 United States Census, 2010 census. Wapello is part of the Muscatine, Iowa, Muscatine Muscatine micropolitan a ...
; the
Skunk River The Skunk River is a tributary of the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), drai ...
south of
Burlington, Iowa Burlington is a city in, and the county seat A county seat is an administrative center, seat of government, or capital city of a county or Parish (administrative division), civil parish. The term is used in Canada, China, Romania, Hungary and the ...
; and the
Des Moines River#REDIRECT Des Moines River The Des Moines River () is a tributary A tributary or affluent is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Trib ...

Des Moines River
at
Keokuk, Iowa Keokuk is a city in and a county seat of Lee County, Iowa, Lee County, Iowa, United States, along with Fort Madison, Iowa, Fort Madison. It is Iowa's southernmost city. The population was 9,900 at the time of the United States Census, 2020, 2020 ...
. Other major tributaries of the Upper Mississippi include the Crow River in Minnesota, the Chippewa River in Wisconsin, the
Maquoketa River The Maquoketa River is a tributary of the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), dr ...
and the
Wapsipinicon River The Wapsipinicon River (, locally known as the Wapsi) is a tributary of the Mississippi River, approximately long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed May 13, 2011 in southeast ...
in Iowa, and the
Illinois River The Illinois River ( mia, Inoka Siipiiwi) is a principal tributary of the Mississippi River and is approximately long. Located in the U.S. state of Illinois, the river drains a large section of central Illinois, with a drainage basin of . The ...
in Illinois. The Upper Mississippi is largely a multi-thread stream with many bars and islands. From its confluence with the St. Croix River downstream to
Dubuque, Iowa Dubuque is the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public administration within ...
, the river is entrenched, with high bedrock bluffs lying on either side. The height of these bluffs decreases to the south of Dubuque, though they are still significant through
Savanna, Illinois Savanna is a city in Carroll County, Illinois, Carroll County, Illinois, United States. The population was 2,945 at the 2010 census, down from 3,542 in 2000. Savanna is located along the Mississippi River at the mouth of the Plum River. Going from ...
. This topography contrasts strongly with the Lower Mississippi, which is a meandering river in a broad, flat area, only rarely flowing alongside a bluff (as at
Vicksburg, Mississippi Vicksburg is a historic city in Warren County, Mississippi Warren County is a County (United States), county located in the U.S. state of Mississippi. As of the 2010 United States Census, 2010 census, the population was 48,773. Its county ...
).


Middle Mississippi

The Mississippi River is known as the Middle Mississippi from the Upper Mississippi River's confluence with the
Missouri River The Missouri River is the longest river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its ...
at
St. Louis, Missouri St. Louis () is the second-largest city in Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. With more than six million residents, it is the List of U.S. states and territor ...

St. Louis, Missouri
, for to its confluence with the
Ohio River The Ohio River is a long river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course wi ...

Ohio River
at
Cairo, Illinois Cairo ( ) is the southernmost city in the U.S. state of Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It has the List of U.S. states and territories by GDP, fifth lar ...
. The Middle Mississippi is relatively free-flowing. From St. Louis to the Ohio River confluence, the Middle Mississippi falls over for an average rate of . At its confluence with the Ohio River, the Middle Mississippi is above sea level. Apart from the Missouri and rivers of Missouri and the
Kaskaskia River Shelbyville Lake and Dam on the Kaskaskia River at Shelbyville, Illinois The Kaskaskia River is a tributary of the Mississippi River, approximately long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe Nationa ...
of Illinois, no major tributaries enter the Middle Mississippi River.


Lower Mississippi

The Mississippi River is called the Lower Mississippi River from its confluence with the Ohio River to its mouth at the Gulf of Mexico, a distance of about . At the confluence of the Ohio and the Middle Mississippi, the long-term mean discharge of the Ohio at Cairo, Illinois is , while the long-term mean discharge of the Mississippi at Thebes, Illinois (just upriver from Cairo) is . Thus, by volume, the main branch of the Mississippi River system at Cairo can be considered to be the Ohio River (and the
Allegheny River The Allegheny River ( ) is a long headwater stream of the Ohio River in western Pennsylvania and New York (state), New York, United States. The Allegheny River runs from its headwaters just below the middle of Pennsylvania's northern border nor ...
further upstream), rather than the Middle Mississippi. In addition to the
Ohio River The Ohio River is a long river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course wi ...

Ohio River
, the major tributaries of the Lower Mississippi River are the White River, flowing in at the in east-central Arkansas; the
Arkansas River The Arkansas River is a major tributary A tributary or affluent is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main ste ...
, joining the Mississippi at
Arkansas Post The Arkansas Post (french: Poste de Arkansea) was the first European settlement in the lower Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river o ...
; the Big Black River in Mississippi; and the
Yazoo River The Yazoo River is a river in the U.S. states of Louisiana and Mississippi. It is considered by some to mark the southern boundary of what is called the Mississippi Delta, a broad floodplain that was cultivated for cotton plantations before the ...
, meeting the Mississippi at
Vicksburg, Mississippi Vicksburg is a historic city in Warren County, Mississippi Warren County is a County (United States), county located in the U.S. state of Mississippi. As of the 2010 United States Census, 2010 census, the population was 48,773. Its county ...
. Deliberate water diversion at the
Old River Control Structure Old River Control Structure discharging water into the Atchafalaya, May 2011 The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into ...
in
Louisiana Louisiana (Standard French Standard French (in French: ''le français standard'', ''le français normé'', ''le français neutre'' eutral Frenchor ''le français international'' nternational French is an unofficial term for a standard ...

Louisiana
allows the
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
in Louisiana to be a major
distributary A distributary, or a distributary channel, is a stream A stream is a body of water (Lysefjord) in Norway Norway, officially the Kingdom of Norway,Names in the official and recognised languages: Bokmål Bokmål (, ; literall ...
of the Mississippi River, with 30% of the combined flow of the Mississippi and Red Rivers flowing to the Gulf of Mexico by this route, rather than continuing down the Mississippi's current channel past
Baton Rouge Baton Rouge ( ; ) is the capital city of the U.S. state of Louisiana. On the eastern bank of the Mississippi River, it is the county seat, parish seat of East Baton Rouge Parish, Louisiana, East Baton Rouge Parish, the most-populous List of par ...

Baton Rouge
and
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
on a longer route to the Gulf. Although the Red River is commonly mistaken for an additional tributary, its water flows separately into the Gulf of Mexico through the Atchafalaya River.


Watershed

The Mississippi River has the world's fourth-largest
drainage basin A drainage basin is any area of land where precipitation In meteorology Meteorology is a branch of the atmospheric sciences Atmospheric science is the study of the Earth's atmosphere File:Atmosphere gas proportions.svg, Compos ...

drainage basin
("watershed" or "catchment"). The basin covers more than , including all or parts of 32 U.S. states and two Canadian provinces. The drainage basin empties into the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin 400px, Diagrammatic cross-section of an ocean basin, showing the various geographic features In hydrology Hydrology (from Greek: wikt:ὕδωρ, ὕδωρ, "hýdōr" meaning ...

Gulf of Mexico
, part of the Atlantic Ocean. The total catchment of the Mississippi River covers nearly 40% of the landmass of the continental United States. The highest point within the watershed is also the highest point of the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with simila ...

Rocky Mountains
,
Mount Elbert Mount Elbert is the highest summit of the Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain syst ...

Mount Elbert
at . In the United States, the Mississippi River drains the majority of the area between the crest of the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with simila ...

Rocky Mountains
and the crest of the
Appalachian Mountains The Appalachian Mountains, often called the Appalachians, are a system of mountains in eastern North America North America is a continent A continent is any of several large landmasses. Generally identified by convention (nor ...

Appalachian Mountains
, except for various regions drained to
Hudson Bay Hudson Bay ( iu, text=ᑲᖏᖅᓱᐊᓗᒃ ᐃᓗᐊ, translit=Kangiqsualuk ilua or iu, text=ᑕᓯᐅᔭᕐᔪᐊᖅ, translit=Tasiujarjuaq; french: baie d'Hudson), sometimes called Hudson's Bay (usually historically), is a large body of sal ...
by the
Red River of the North The Red River (french: rivière Rouge or , American English: Red River of the North) is a river in the north-central United States and central Canada. Originating at the confluence of the Bois de Sioux River, Bois de Sioux and Otter Tail River, ...

Red River of the North
; to the Atlantic Ocean by the
Great Lakes The Great Lakes also called the Great Lakes of North America or the Laurentian Great Lakes, is a series of large interconnected freshwater lake A lake is an area filled with water, localized in a basin, surrounded by land Land ...

Great Lakes
and the
Saint Lawrence River The St. Lawrence River is a large river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its c ...
; and to the Gulf of Mexico by the
Rio Grande The Rio Grande ( and ), known in Mexico as the Río Bravo del Norte and as the Río Bravo, is one of the principal river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another r ...

Rio Grande
, the
Alabama (We dare defend our rights) , anthem = "Alabama (We dare defend our rights) , anthem = "Alabama (state song), Alabama" , image_map = Alabama in United States.svg , seat ...

Alabama
and Tombigbee rivers, the
Chattahoochee The Chattahoochee River forms the southern half of the Alabama (We dare defend our rights) , anthem = "Alabama (state song), Alabama" , image_map = Alabama in United States.svg , seat = Mon ...

Chattahoochee
and rivers, and various smaller coastal waterways along the Gulf. The Mississippi River empties into the Gulf of Mexico about downstream from New Orleans. Measurements of the length of the Mississippi from Lake Itasca to the Gulf of Mexico vary somewhat, but the
United States Geological Survey The United States Geological Survey, abbreviated USGS and formerly simply known as the Geological Survey, is a scientific government agency, agency of the Federal government of the United States, United States government. The scientists of the ...
's number is . The retention time from Lake Itasca to the Gulf is typically about 90 days. The
stream gradientStream gradient is the grade (slope), grade measured by the ratio of drop in elevation of a stream per unit horizontal distance, usually expressed as metre, meters per kilometre, kilometer or Foot (length), feet per mile. Hydrology and geology A hig ...
of the entire river is 0.01%, a drop of 450 m over 3,766 km.


Outflow

The Mississippi River discharges at an annual average rate of between . Although it is the fourteenth-largest river in the world by volume, this flow is a small fraction of the output of , which moves nearly during wet seasons. On average, the Mississippi has only 8% the flow of the Amazon River. Fresh river water flowing from the Mississippi into the Gulf of Mexico does not mix into the salt water immediately. The images from
NASA The National Aeronautics and Space Administration (NASA; ) is an independent agency A regulatory agency or regulatory authority, is a Public benefit corporation Public-benefit corporation is a term that has different meanings in differen ...

NASA
's
MODIS The Moderate Resolution Imaging Spectroradiometer (MODIS) is a satellite-based sensor used for earth and climate measurements. There are two MODIS sensors in Earth orbit A geocentric orbit or Earth orbit involves any object orbiting the ...
(to the right) show a large plume of fresh water, which appears as a dark ribbon against the lighter-blue surrounding waters. These images demonstrate that the plume did not mix with the surrounding sea water immediately. Instead, it stayed intact as it flowed through the Gulf of Mexico, into the
Straits of Florida 250px, The Straits of Florida The Straits of Florida, Florida Straits, or Florida Strait ( es, Estrecho de Florida) is a strait A strait is a naturally formed, narrow, typically navigable waterway that connects two larger bodies of water. M ...

Straits of Florida
, and entered the
Gulf Stream The Gulf Stream, together with its northern extension the North Atlantic Drift The North Atlantic Current (NAC), also known as North Atlantic Drift and North Atlantic Sea Movement, is a powerful warm western boundary current Boundary curren ...
. The Mississippi River water rounded the tip of Florida and traveled up the southeast coast to the latitude of
Georgia Georgia usually refers to: * Georgia (country) Georgia (, ; ) is a country located at the intersection of Eastern Europe and Western Asia. It is a part of the Caucasus region, bounded to the west by the Black Sea, to the north and east by ...
before finally mixing in so thoroughly with the ocean that it could no longer be detected by MODIS. Before 1900, the Mississippi River transported an estimated of
sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently sediment transport, transported by the action of wind, water, or ice or by the force of gravity acting on the particles. ...

sediment
per year from the interior of the United States to coastal Louisiana and the Gulf of Mexico. During the last two decades, this number was only per year. The reduction in
sediment transport Sediment transport is the movement of solid particles (sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently sediment transport, transported by the action of wind ...
ed down the Mississippi River is the result of engineering modification of the Mississippi, Missouri, and Ohio rivers and their tributaries by dams,
meander cutoff A meander cutoff, the natural form of a cutting or cut in a river occurs when a pronounced meander Meanders of the '' Rio Cauto'' at Guamo Embarcadero, Cuba A meander is one of a series of regular sinuous curves, bends, loops, turns, or winding ...
s, river-training structures, and bank revetments and soil
erosion In earth science Earth science or geoscience includes all fields of natural science Natural science is a branch of science Science (from the Latin word ''scientia'', meaning "knowledge") is a systematic enterprise that Scientific ...

erosion
control programs in the areas drained by them.Meade, R. H., and J. A. Moody, 1984, ''Causes for the decline of suspended-sediment discharge in the Mississippi River system, 1940–2007'' Hydrology Processes vol. 24, pp. 35–49.


Course changes

Over geologic time, the Mississippi River has experienced numerous large and small changes to its main course, as well as additions, deletions, and other changes among its numerous tributaries, and the lower Mississippi River has used different pathways as its main channel to the Gulf of Mexico across the delta region. Through a natural process known as avulsion or delta switching, the lower Mississippi River has shifted its final course to the mouth of the Gulf of Mexico every thousand years or so. This occurs because the deposits of silt and sediment begin to clog its channel, raising the river's level and causing it to eventually find a steeper, more direct route to the Gulf of Mexico. The abandoned distributaries diminish in volume and form what are known as
bayou In usage in the Southern United States, a bayou () is a body of water typically found in a flat, low-lying area, and may refer to an extremely slow-moving stream or river (often with a poorly defined shoreline), a marshy lake or wetland or a creek ...

bayou
s. This process has, over the past 5,000 years, caused the coastline of south Louisiana to advance toward the Gulf from . The currently active is called the Birdfoot Delta, after its shape, or the Balize Delta, after La Balize, Louisiana, the first French settlement at the mouth of the Mississippi.


Prehistoric courses

The current form of the Mississippi River basin was largely shaped by the Laurentide Ice Sheet of the Last glacial period, most recent Ice Age. The southernmost extent of this enormous glaciation extended well into the present-day United States and Mississippi basin. When the ice sheet began to recede, hundreds of feet of rich sediment were deposited, creating the flat and fertile landscape of the Mississippi Valley. During the melt, giant glacial rivers found drainage paths into the Mississippi watershed, creating such features as the
Minnesota River The Minnesota River ( dak, Mnísota Wakpá) is a tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tribut ...

Minnesota River
, James River (Dakotas), James River, and Milk River (Montana-Alberta), Milk River valleys. When the ice sheet completely retreated, many of these "temporary" rivers found paths to
Hudson Bay Hudson Bay ( iu, text=ᑲᖏᖅᓱᐊᓗᒃ ᐃᓗᐊ, translit=Kangiqsualuk ilua or iu, text=ᑕᓯᐅᔭᕐᔪᐊᖅ, translit=Tasiujarjuaq; french: baie d'Hudson), sometimes called Hudson's Bay (usually historically), is a large body of sal ...
or the Arctic Ocean, leaving the Mississippi Basin with many features "over-sized" for the existing rivers to have carved in the same time period. Ice sheets during the Illinoian (stage), Illinoian Stage, about 300,000 to 132,000 years before present, blocked the Mississippi near Rock Island, Illinois, diverting it to its present channel farther to the west, the current western border of Illinois. The Hennepin Canal Parkway State Park, Hennepin Canal roughly follows the ancient channel of the Mississippi downstream from Rock Island to Hennepin, Illinois. South of Hennepin, to Alton, Illinois, the current
Illinois River The Illinois River ( mia, Inoka Siipiiwi) is a principal tributary of the Mississippi River and is approximately long. Located in the U.S. state of Illinois, the river drains a large section of central Illinois, with a drainage basin of . The ...
follows the ancient channel used by the Mississippi River before the Illinoian Stage.McKay, E.D., 2007
''Six Rivers, Five Glaciers, and an Outburst Flood: the Considerable Legacy of the Illinois River.''
(PDF) Proceedings of the 2007 Governor's Conference on the Management of the Illinois River System: Our continuing Commitment, 11th Biennial Conference, Oct. 2–4, 2007, 11 p.
McKay, E.D., and R.C. Berg, 2008

Geological Society of America Abstracts with Programs, Vol. 40, No. 5, p. 78 wit
Powerpoint presentation
Timeline of outflow course changes * c. 5000 BC: The last Ice Age ended; world sea level became what it is now. * c. 2500 BC: Bayou Teche became the main course of the Mississippi. * c. 800 BC: The Mississippi diverted further east. * c. 200 AD: Bayou Lafourche became the main course of the Mississippi. * c. 1000 AD: The Mississippi's present course took over. * Before c. 1400 AD: The Red River of the South flowed parallel to the lower Mississippi to the sea * 15th century: Turnbull's Bend in the lower Mississippi extended so far west that it captured the Red River of the South. The Red River below the captured section became the
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
. * 1831: Captain Henry M. Shreve dug a new short course for the Mississippi through the neck of Turnbull's Bend. * 1833 to November 1873: The Great Raft (a huge logjam in the Atchafalaya River) was cleared. The Atchafalaya started to capture the Mississippi and to become its new main lower course. * 1963: The
Old River Control Structure Old River Control Structure discharging water into the Atchafalaya, May 2011 The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into ...
was completed, controlling how much Mississippi water entered the Atchafalaya.


Historic course changes

In March 1876, the Mississippi suddenly changed course near the settlement of Reverie, Tennessee, leaving a small part of Tipton County, Tennessee, attached to
Arkansas Arkansas () is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper ...

Arkansas
and separated from the rest of
Tennessee Tennessee (, ), officially the State of Tennessee, is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The S ...

Tennessee
by the new river channel. Since this event was an avulsion, rather than the effect of incremental erosion and deposition, the state line still follows the old channel. The town of Kaskaskia, Illinois once stood on a peninsula at the confluence of the Mississippi and Kaskaskia River, Kaskaskia (Okaw) Rivers. Founded as a French colonial community, it later became the capital of the Illinois Territory and was the first state capital of Illinois until 1819. Beginning in 1844, successive flooding caused the Mississippi River to slowly encroach east. A major flood in 1881 caused it to overtake the lower of the Kaskaskia River, forming a new Mississippi channel and cutting off the town from the rest of the state. Later flooding destroyed most of the remaining town, including the original State House. Today, the remaining island and community of 14 residents is known as an enclave of Illinois and is accessible only from the Missouri side.


New Madrid Seismic Zone

The New Madrid Seismic Zone, along the Mississippi River near New Madrid, Missouri, between Memphis and St. Louis, is related to an aulacogen (failed rift) that formed at the same time as the Gulf of Mexico. This area is still quite active seismically. 1812 New Madrid earthquake, Four great earthquakes in 1811 and 1812, estimated at approximately 8 on the Richter magnitude scale, had tremendous local effects in the then sparsely settled area, and were felt in many other places in the Midwestern and eastern U.S. These earthquakes created Reelfoot Lake in Tennessee from the altered landscape near the river.


Length

When measured from its traditional source at
Lake Itasca Lake Itasca is a small glacial lake, approximately in area. Located in southeastern Clearwater County, in the Headwaters area of north central Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. ...

Lake Itasca
, the Mississippi has a length of . When measured from its longest stream source (most distant source from the sea), Brower's Spring in Montana, the source of the
Missouri River The Missouri River is the longest river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its ...
, it has a length of , making it the fourth longest river in the world after the Nile, Amazon River, Amazon, and Yangtze. When measured by the largest stream source (by water volume), the
Ohio River The Ohio River is a long river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course wi ...

Ohio River
, by extension the
Allegheny River The Allegheny River ( ) is a long headwater stream of the Ohio River in western Pennsylvania and New York (state), New York, United States. The Allegheny River runs from its headwaters just below the middle of Pennsylvania's northern border nor ...
, would be the source, and the Mississippi would begin in Pennsylvania.


Depth

At its source at
Lake Itasca Lake Itasca is a small glacial lake, approximately in area. Located in southeastern Clearwater County, in the Headwaters area of north central Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. ...

Lake Itasca
, the Mississippi River is about deep. The average depth of the Mississippi River between Saint Paul and Saint Louis is between deep, the deepest part being
Lake Pepin Lake Pepin is a naturally occurring lake on the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorpholo ...
, which averages deep and has a maximum depth of . Between where the Missouri River joins the Mississippi at Saint Louis, Missouri, and Cairo, Illinois, the depth averages . Below Cairo, where the Ohio River joins, the depth averages deep. The deepest part of the river is in New Orleans, where it reaches deep.


Cultural geography


State boundaries

The Mississippi River runs through or along 10 states, from
Minnesota Minnesota () is a U.S. state, state in the Upper Midwest, upper Midwestern United States. It is the List of U.S. states and territories by area, 12th largest U.S. state in area and the List of U.S. states and territories by population, 22nd m ...

Minnesota
to
Louisiana Louisiana (Standard French Standard French (in French: ''le français standard'', ''le français normé'', ''le français neutre'' eutral Frenchor ''le français international'' nternational French is an unofficial term for a standard ...

Louisiana
, and is used to define portions of these states borders, with
Wisconsin Wisconsin () is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper ...

Wisconsin
,
Illinois Illinois ( ) is a in the region of the . Of the fifty U.S. states, it has the , population, and the . is the state's largest city and the fifth with the capital in , located in the center of the state; other major metropolitan areas in ...

Illinois
,
Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ...
,
Tennessee Tennessee (, ), officially the State of Tennessee, is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The S ...

Tennessee
, and
Mississippi Mississippi () is a in the region of the , bordered to the north by ; to the east by ; to the south by the ; to the southwest by ; and to the northwest by . Mississippi's western boundary is largely defined by the . Mississippi is the and ...
along the east side of the river, and
Iowa Iowa () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wiscon ...

Iowa
,
Missouri Missouri is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper in ...

Missouri
, and
Arkansas Arkansas () is a state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * The State (newspaper), ''The State'' (newspaper), a daily newspaper ...

Arkansas
along its west side. Substantial parts of both Minnesota and Louisiana are on either side of the river, although the Mississippi defines part of the boundary of each of these states. In all of these cases, the middle of the riverbed at the time the borders were established was used as the line to define the borders between adjacent states. In various areas, the river has since shifted, but the state borders have not changed, still following the former bed of the Mississippi River as of their establishment, leaving several small isolated areas of one state across the new river channel, contiguous with the adjacent state. Also, due to a meander in the river, a Kentucky Bend, small part of western Kentucky is contiguous with Tennessee but isolated from the rest of its state.


Communities along the river

Many of the communities along the Mississippi River are listed below; most have either historic significance or cultural lore connecting them to the river. They are sequenced from the source of the river to its end. * Bemidji, Minnesota *
Grand Rapids, Minnesota Grand Rapids is a city in and the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public admin ...
* Jacobson, Minnesota * Palisade, Minnesota * Aitkin, Minnesota * Riverton, Minnesota * Brainerd, Minnesota * Fort Ripley, Minnesota * Little Falls, Minnesota * Sartell, Minnesota * St. Cloud, Minnesota * Monticello, Minnesota * Anoka, Minnesota *
Coon Rapids, Minnesota Coon Rapids is a northern suburb of Minneapolis Minneapolis () is the most populous city in the US state of Minnesota and the seat of Hennepin County, Minnesota, Hennepin County. With an estimated population of 429,606 as of 2019, it is the Li ...
* Brooklyn Park, Minnesota * Brooklyn Center, Minnesota *
Minneapolis, Minnesota Minneapolis () is a city in the of . With a population of 429,954 as of , it is the most populous city in the state and the 46th most populous in the nation. The of , Minneapolis lies along both banks of the , just north of its confluence wit ...

Minneapolis, Minnesota
*
Saint Paul, Minnesota Saint Paul (abbreviated St. Paul) is the List of capitals in the United States, capital of the U.S. state of Minnesota and the county seat of Ramsey County, Minnesota, Ramsey County. Historically a major railroad and commercial center for the Up ...
* Nininger, Minnesota * Hastings, Minnesota * Prescott, Wisconsin * Prairie Island Indian Community, Prairie Island, Minnesota * Diamond Bluff, Wisconsin *
Red Wing, Minnesota Red Wing is a city in Goodhue County, Minnesota, Goodhue County, Minnesota, United States, along the upper Mississippi River. The population was 16,459 at the 2010 United States Census, 2010 census. It is the county seat of Goodhue County. Red ...

Red Wing, Minnesota
* Hager City, Wisconsin * Maiden Rock, Wisconsin * Stockholm, Wisconsin * Lake City, Minnesota * Maple Springs, Minnesota * Camp Lacupolis, Minnesota * Pepin, Wisconsin * Reads Landing, Minnesota *
Wabasha, Minnesota Wabasha is a city in Wabasha County, Minnesota Minnesota () is a U.S. state, state in the north central region of the United States. It is known as the "Land of 10,000 Lakes". Its official motto is , French for "The Star of the North". Of t ...
* Nelson, Wisconsin * Alma, Wisconsin * Buffalo City, Wisconsin * Weaver, Minnesota * Minneiska, Minnesota * Fountain City, Wisconsin * Winona, Minnesota * Homer, Minnesota * Trempealeau (village), Wisconsin, Trempealeau, Wisconsin * Dakota, Minnesota * Dresbach Township, Winona County, Minnesota, Dresbach, Minnesota * La Crescent, Minnesota *
La Crosse, Wisconsin La Crosse is a city in the U.S. state of Wisconsin and the county seat of La Crosse County, Wisconsin, La Crosse County. Positioned alongside the Mississippi River, La Crosse is the largest city on Wisconsin's western border. La Crosse's populatio ...
* Brownsville, Minnesota * Stoddard, Wisconsin * Genoa, Wisconsin * Victory, Wisconsin * Potosi, Wisconsin * De Soto, Wisconsin * Lansing, Iowa * Ferryville, Wisconsin * Lynxville, Wisconsin *
Prairie du Chien, Wisconsin Prairie du Chien () is a city in and the county seat of Crawford County, Wisconsin, Crawford County, Wisconsin, United States. The population was 5,911 at the 2010 census. Its ZIP Code is 53821. Often referred to as Wisconsin's second oldest cit ...
* Marquette, Iowa * McGregor, Iowa * Wyalusing, Wisconsin * Guttenberg, Iowa * Cassville, Wisconsin *
Dubuque, Iowa Dubuque is the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public administration within ...
* Galena, Illinois * Bellevue, Iowa *
Savanna, Illinois Savanna is a city in Carroll County, Illinois, Carroll County, Illinois, United States. The population was 2,945 at the 2010 census, down from 3,542 in 2000. Savanna is located along the Mississippi River at the mouth of the Plum River. Going from ...
* Sabula, Iowa * Fulton, Illinois * Clinton, Iowa * Cordova, Illinois * Port Byron, Illinois * LeClaire, Iowa * Rapids City, Illinois * Hampton, Illinois * Bettendorf, Iowa * East Moline, Illinois * Moline, Illinois * Davenport, Iowa * Rock Island, Illinois * Buffalo, Iowa * Muscatine, Iowa * New Boston, Illinois * Keithsburg, Illinois * Oquawka, Illinois *
Burlington, Iowa Burlington is a city in, and the county seat A county seat is an administrative center, seat of government, or capital city of a county or Parish (administrative division), civil parish. The term is used in Canada, China, Romania, Hungary and the ...
* Dallas City, Illinois * Fort Madison, Iowa * Nauvoo, Illinois *
Keokuk, Iowa Keokuk is a city in and a county seat of Lee County, Iowa, Lee County, Iowa, United States, along with Fort Madison, Iowa, Fort Madison. It is Iowa's southernmost city. The population was 9,900 at the time of the United States Census, 2020, 2020 ...
* Warsaw, Illinois * Quincy, Illinois * Hannibal, Missouri * Louisiana, Missouri * Clarksville, Missouri * Grafton, Illinois * Portage Des Sioux, Missouri * Alton, Illinois * St. Louis, St. Louis, Missouri * Ste. Genevieve, Missouri * Kaskaskia, Illinois * Chester, Illinois * Grand Tower, Illinois * Cape Girardeau, Missouri * Thebes, Illinois * Commerce, Missouri *
Cairo, Illinois Cairo ( ) is the southernmost city in the U.S. state of Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It has the List of U.S. states and territories by GDP, fifth lar ...
* Wickliffe, Kentucky * Columbus, Kentucky * Hickman, Kentucky * New Madrid, Missouri * Tiptonville, Tennessee * Caruthersville, Missouri * Osceola, Arkansas * Reverie, Tennessee * Memphis, Tennessee * West Memphis, Arkansas * Tunica, Mississippi * Helena-West Helena, Arkansas * Napoleon, Arkansas (historical) * Arkansas City, Arkansas * Greenville, Mississippi * Mayersville, Mississippi *
Vicksburg, Mississippi Vicksburg is a historic city in Warren County, Mississippi Warren County is a County (United States), county located in the U.S. state of Mississippi. As of the 2010 United States Census, 2010 census, the population was 48,773. Its county ...
* Waterproof, Louisiana * Natchez, Mississippi * Morganza, Louisiana * St. Francisville, Louisiana * New Roads, Louisiana * Baton Rouge, Louisiana * Donaldsonville, Louisiana * Lutcher, Louisiana * Destrehan, Louisiana * New Orleans, New Orleans, Louisiana * Pilottown, Louisiana * La Balize, Louisiana (historical)


Bridge crossings

The road crossing highest on the Upper Mississippi is a simple steel culvert, through which the river (locally named "Nicolet Creek") flows north from Lake Nicolet under "Wilderness Road" to the West Arm of Lake Itasca, within
Itasca State Park Itasca State Park is a state park of Minnesota, United States, and contains the headwaters of the Mississippi River. The park spans of northern Minnesota, and is located about north of Park Rapids, Minnesota and from Bagley, Minnesota. The park ...
. The earliest bridge across the Mississippi River was built in 1855. It spanned the river in Minneapolis where the current Hennepin Avenue Bridge is located. No highway or railroad tunnels cross under the Mississippi River. The first railroad bridge across the Mississippi was built in 1856. It spanned the river between the Rock Island Arsenal in
Illinois Illinois ( ) is a in the region of the . Of the fifty U.S. states, it has the , population, and the . is the state's largest city and the fifth with the capital in , located in the center of the state; other major metropolitan areas in ...

Illinois
and Davenport, Iowa. Steamboat captains of the day, fearful of competition from the railroads, considered the new bridge a hazard to navigation. Two weeks after the bridge opened, the steamboat ''Effie Afton'' rammed part of the bridge, setting it on fire. Legal proceedings ensued, with Abraham Lincoln defending the railroad. The lawsuit went to the Supreme Court of the United States, which ruled in favor of the railroad. Below is a general overview of selected Mississippi bridges that have notable engineering or landmark significance, with their cities or locations. They are sequenced from the Upper Mississippi's source to the Lower Mississippi's mouth. * Stone Arch Bridge (Minneapolis), Stone Arch BridgeFormer Great Northern Railway (U.S.), Great Northern Railway (now pedestrian) bridge at
Saint Anthony Falls Saint Anthony Falls, or the Falls of Saint Anthony, northeast of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Upper Mississippi River. The natural falls were replaced by a concrete overflow spillway (also called an "a ...
connecting downtown Minneapolis with the historic Marcy-Holmes neighborhood. * I-35W Saint Anthony Falls BridgeIn Minneapolis, opened in September 2008, replacing the I-35W Mississippi River bridge which had collapsed catastrophically on August 1, 2007, killing 13 and injuring over 100. * Eisenhower Bridge (Mississippi River)In
Red Wing, Minnesota Red Wing is a city in Goodhue County, Minnesota, Goodhue County, Minnesota, United States, along the upper Mississippi River. The population was 16,459 at the 2010 United States Census, 2010 census. It is the county seat of Goodhue County. Red ...

Red Wing, Minnesota
, opened by Dwight D. Eisenhower in November 1960. * I-90 Mississippi River BridgeConnects
La Crosse, Wisconsin La Crosse is a city in the U.S. state of Wisconsin and the county seat of La Crosse County, Wisconsin, La Crosse County. Positioned alongside the Mississippi River, La Crosse is the largest city on Wisconsin's western border. La Crosse's populatio ...
, and Winona County, Minnesota, located just south of Lock and Dam No. 7. * Black Hawk BridgeConnects Lansing, Iowa, Lansing in Allamakee County, Iowa and rural Crawford County, Wisconsin; locally referred to as the Lansing Bridge and documented in the Historic American Buildings Survey, Historic American Engineering Record. * Dubuque-Wisconsin BridgeConnects
Dubuque, Iowa Dubuque is the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public administration within ...
, and Grant County, Wisconsin. * Julien Dubuque BridgeJoins the cities of
Dubuque, Iowa Dubuque is the county seat A county seat is an administrative centerAn administrative centre is a seat of regional administration or local government Local government is a generic term for the lowest tiers of public administration within ...
, and East Dubuque, Illinois; listed in the National Register of Historic Places. * Savanna-Sabula BridgeA truss bridge and causeway connecting the city of
Savanna, Illinois Savanna is a city in Carroll County, Illinois, Carroll County, Illinois, United States. The population was 2,945 at the 2010 census, down from 3,542 in 2000. Savanna is located along the Mississippi River at the mouth of the Plum River. Going from ...
, and the island city of Sabula, Iowa. The bridge carries U.S. Highway 52 over the river, and is the terminus of both Iowa Highway 64 and Illinois Route 64. Added to the National Register of Historic Places in 1999. * Fred Schwengel Memorial BridgeA 4-lane steel girder bridge that carries Interstate 80 and connects LeClaire, Iowa, and Rapids City, Illinois. Completed in 1966. * Clinton Railroad BridgeA swing bridge that connects Clinton, Iowa and Fulton, Illinois, Fulton (Albany, Illinois, Albany),
Illinois Illinois ( ) is a in the region of the . Of the fifty U.S. states, it has the , population, and the . is the state's largest city and the fifth with the capital in , located in the center of the state; other major metropolitan areas in ...

Illinois
. Known as the Chicago and Northwestern Railroad Bridge. * I-74 BridgeConnects Bettendorf, Iowa, and Moline, Illinois; originally known as the ''Iowa-Illinois Memorial Bridge''. * Government BridgeConnects Rock Island, Illinois and Davenport, Iowa, adjacent to Lock and Dam No. 15; the fourth crossing in this vicinity, built in 1896. * Rock Island Centennial BridgeConnects Rock Island, Illinois, and Davenport, Iowa; opened in 1940. * Sergeant John F. Baker, Jr. BridgeConnects Rock Island, Illinois, and Davenport, Iowa; opened in 1973. * Norbert F. Beckey BridgeConnects Muscatine, Iowa, and Rock Island County, Illinois; became first U.S. bridge to be illuminated with light-emitting diode (LED) lights decoratively illuminating the facade of the bridge. * Great River BridgeA cable-stayed bridge connecting Burlington, Iowa, to Gulf Port, Illinois. * Fort Madison Toll BridgeConnects Fort Madison, Iowa, and unincorporated Niota, Illinois; also known as the ''Santa Fe Swing Span Bridge''; at the time of its construction the longest and heaviest electrified swing span on the Mississippi River. Listed in the National Register of Historic Places since 1999. * Keokuk–Hamilton BridgeConnects
Keokuk, Iowa Keokuk is a city in and a county seat of Lee County, Iowa, Lee County, Iowa, United States, along with Fort Madison, Iowa, Fort Madison. It is Iowa's southernmost city. The population was 9,900 at the time of the United States Census, 2020, 2020 ...
and Hamilton, Illinois; opened in 1985 replacing an older bridge which is still in use as a railroad bridge. * Bayview BridgeA cable-stayed bridge bringing westbound U.S. Highway 24 over the river, connecting the cities of West Quincy, Missouri, and Quincy, Illinois. * Quincy Memorial BridgeConnects the cities of West Quincy, Missouri, and Quincy, Illinois, carrying eastbound U.S. 24, the older of these two U.S. 24 bridges. * Clark BridgeA cable-stayed bridge connecting West Alton, Missouri, and Alton, Illinois, also known as the ''Super Bridge'' as the result of an appearance on the PBS program, ''Nova (American TV series), Nova''; built in 1994, carrying U.S. Route 67 across the river. This is the northernmost river crossing in the St. Louis metropolitan area, replacing the ''Old Clark Bridge'', a truss bridge built in 1928, named after explorer William Clark (explorer), William Clark. * Chain of Rocks BridgeLocated on the northern edge of St. Louis, notable for a 22-degree bend occurring at the middle of the crossing, necessary for navigation on the river; formerly used by U.S. Route 66 to cross the Mississippi. Replaced for road traffic in 1966 by New Chain of Rocks Bridge, a nearby pair of new bridges; now a pedestrian bridge. * Eads BridgeA combined road and railway bridge, connecting St. Louis and East St. Louis, Illinois. When completed in 1874, it was the longest arch bridge in the world, with an overall length of . The three ribbed steel arch spans were considered daring, as was the use of steel as a primary structural material; it was the first such use of true steel in a major bridge project. * Chester BridgeA truss bridge connecting Route 51 (Missouri), Route 51 in Missouri with Illinois Route 150, between Perryville, Missouri, and Chester, Illinois. The bridge can be seen at the beginning of the 1967 film ''In the Heat of the Night (film), In the Heat of the Night''. In the 1940s, the main span was destroyed by a tornado. * Bill Emerson Memorial Bridge—Connecting Cape Girardeau, Missouri and East Cape Girardeau, Illinois, completed in 2003 and illuminated by 140 lights. * Caruthersville Bridge A single tower cantilever bridge carrying Interstate 155 (Missouri–Tennessee), Interstate 155 and U.S. Route 412 across the Mississippi River between Caruthersville, Missouri and Dyersburg, Tennessee. * Hernando de Soto BridgeA through arch bridge carrying Interstate 40 across the Mississippi between West Memphis, Arkansas, and Memphis, Tennessee. * Harahan BridgeA Cantilever bridge, cantilevered truss bridge, through truss bridge, carrying two rail lines of the Union Pacific Railroad across the river between West Memphis, Arkansas, and Memphis, Tennessee. * Frisco BridgeA Cantilever bridge, cantilevered truss bridge, through truss bridge, carrying a rail line across the river between West Memphis, Arkansas, and Memphis, Tennessee, previously known as the ''Memphis Bridge''. When it opened on May 12, 1892, it was the first crossing of the Lower Mississippi and the longest span in the U.S. Listed as a List of historic civil engineering landmarks, Historic Civil Engineering Landmark. * Memphis & Arkansas BridgeA cantilever bridge, cantilevered truss bridge, through truss bridge, carrying Interstate 55 between Memphis and West Memphis; listed on the National Register of Historic Places. * Helena Bridge * Greenville Bridge * Old Vicksburg Bridge * Vicksburg Bridge * Natchez-Vidalia Bridge * John James Audubon Bridge (Mississippi River), John James Audubon BridgeThe second-longest cable-stayed bridge in the Western Hemisphere; connects Pointe Coupee Parish, Louisiana, Pointe Coupee and West Feliciana Parish, Louisiana, West Feliciana Parishes in Louisiana. It is the only crossing between Baton Rouge and Natchez. This bridge was opened a month ahead of schedule in May 2011, due to the 2011 Mississippi River floods, 2011 floods. * Huey P. Long Bridge (Baton Rouge), Huey P. Long BridgeA truss cantilever bridge carrying U.S. Route 190, US 190 (Airline Highway) and one rail line between East Baton Rouge Parish, Louisiana, East Baton Rouge and West Baton Rouge Parish, Louisiana, West Baton Rouge Parishes in Louisiana. * Horace Wilkinson BridgeA cantilever bridge, cantilevered truss bridge, through truss bridge, carrying six lanes of Interstate 10 between Baton Rouge, Louisiana, Baton Rouge and Port Allen, Louisiana, Port Allen in Louisiana. It is the highest bridge over the Mississippi River. * Sunshine Bridge * Gramercy Bridge * Hale Boggs Memorial Bridge * Huey P. Long Bridge (Jefferson Parish), Huey P. Long BridgeIn Jefferson Parish, Louisiana, the first Mississippi River span built in Louisiana. * Crescent City ConnectionConnects the east and west banks of
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
, Louisiana; the fifth-longest cantilever bridge in the world.


Navigation and flood control

A clear channel is needed for the
barge A barge is a - , built mainly for and transport of bulk goods. Originally barges were towed by draft horses on an adjacent . Barges have changed throughout time. From 1967-1983 barges were considered a flat bottom boat that was nineteen feet ...

barge
s and other vessels that make the main stem Mississippi one of the great commercial waterways of the world. The task of maintaining a navigation channel is the responsibility of the United States Army Corps of Engineers, which was established in 1802. Earlier projects began as early as 1829 to remove snags, close off secondary channels and excavate rocks and Shoal, sandbars. Steamboats entered trade in the 1820s, so the period 1830–1850 became the golden age of steamboats. As there were few roads or rails in the lands of the Louisiana Purchase, river traffic was an ideal solution. Cotton, timber and food came down the river, as did Appalachian coal. The port of New Orleans boomed as it was the trans-shipment point to deep sea ocean vessels. As a result, the image of the twin-stacked, wedding cake Mississippi steamer entered into American mythology. Steamers worked the entire route from the trickles of Montana to the Ohio River; down the Missouri and Tennessee, to the main channel of the Mississippi. Only with the arrival of the railroads in the 1880s did steamboat traffic diminish. Steamboats remained a feature until the 1920s. Most have been superseded by pusher tugs. A few survive as icons—the Delta Queen and the River Queen (steamboat), River Queen for instance. A series of 29 Lock (water transport), locks and dams on the upper Mississippi, most of which were built in the 1930s, is designed primarily to maintain a channel for commercial barge traffic. The lakes formed are also used for recreational boating and fishing. The dams make the river deeper and wider but do not stop it. No flood control is intended. During periods of high flow, the gates, some of which are submersible, are completely opened and the dams simply cease to function. Below St. Louis, the Mississippi is relatively free-flowing, although it is constrained by numerous levees and directed by numerous wing dams. On the lower Mississippi, from Baton Rouge, Louisiana, Baton Rouge to the mouth of the Mississippi, the navigation depth is , allowing container ships and cruise ships to dock at the Port of New Orleans and bulk cargo ships shorter than air draft that fit under the Huey P. Long Bridge (Jefferson Parish), Huey P. Long Bridge to traverse the Mississippi to Baton Rouge. There is a feasibility study to dredge this portion of the river to to allow New Panamax ship depths.


19th century

In 1829, there were surveys of the two major obstacles on the upper Mississippi, the Des Moines Rapids and the Rock Island Rapids, where the river was shallow and the riverbed was rock. The Des Moines Rapids were about long and just above the mouth of the
Des Moines River#REDIRECT Des Moines River The Des Moines River () is a tributary A tributary or affluent is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Trib ...

Des Moines River
at Keokuk, Iowa. The Rock Island Rapids were between Rock Island, Illinois, Rock Island and Moline, Illinois. Both rapids were considered virtually impassable. In 1848, the Illinois and Michigan Canal was built to connect the Mississippi River to Lake Michigan via the Illinois River near Peru, Illinois. The canal allowed shipping between these important waterways. In 1900, the canal was replaced by the Chicago Sanitary and Ship Canal. The second canal, in addition to shipping, also allowed Chicago to address specific health issues (typhoid fever, cholera and other waterborne diseases) by sending its waste down the Illinois and Mississippi river systems rather than polluting its water source of Lake Michigan. The Corps of Engineers recommended the excavation of a channel at the Des Moines Rapids, but work did not begin until after Lieutenant Robert E. Lee endorsed the project in 1837. The Corps later also began excavating the Rock Island Rapids. By 1866, it had become evident that excavation was impractical, and it was decided to build a canal around the Des Moines Rapids. The canal opened in 1877, but the Rock Island Rapids remained an obstacle. In 1878, Congress authorized the Corps to establish a channel to be obtained by building wing dams that direct the river to a narrow channel causing it to cut a deeper channel, by closing secondary channels and by dredging. The channel project was complete when the Moline Lock, which bypassed the Rock Island Rapids, opened in 1907. To improve navigation between St. Paul, Minnesota, and
Prairie du Chien, Wisconsin Prairie du Chien () is a city in and the county seat of Crawford County, Wisconsin, Crawford County, Wisconsin, United States. The population was 5,911 at the 2010 census. Its ZIP Code is 53821. Often referred to as Wisconsin's second oldest cit ...
, the Corps constructed several dams on lakes in the headwaters area, including
Lake Winnibigoshish Lake Winnibigoshish is a body of water in north central Minnesota, in the Chippewa National Forest. Its name comes from the Ojibwe language ''Wiinibiigoonzhish'', a diminutive and pejorative form of ''Wiinibiig'', meaning "filthy water" (i.e., "bra ...
and Pokegama Dam, Lake Pokegama. The dams, which were built beginning in the 1880s, stored spring run-off which was released during low water to help maintain channel depth.


20th century

In 1907, Congress authorized a channel project on the Mississippi River, which was not complete when it was abandoned in the late 1920s in favor of the channel project. In 1913, construction was complete on Lock and Dam No. 19 at
Keokuk, Iowa Keokuk is a city in and a county seat of Lee County, Iowa, Lee County, Iowa, United States, along with Fort Madison, Iowa, Fort Madison. It is Iowa's southernmost city. The population was 9,900 at the time of the United States Census, 2020, 2020 ...
, the first dam below St. Anthony Falls. Built by a private power company (Union Electric Company of St. Louis) to generate electricity (originally for streetcars in St. Louis), the Keokuk dam was one of the largest hydro-electric plants in the world at the time. The dam also eliminated the Des Moines Rapids. Lock and Dam No. 1, Mississippi River, Lock and Dam No. 1 was completed in Minneapolis, Minnesota in 1917. Lock and Dam No. 2, near Hastings, Minnesota, was completed in 1930. Before the Great Mississippi Flood of 1927, the Corps's primary strategy was to close off as many side channels as possible to increase the flow in the main river. It was thought that the river's velocity would scour off bottom
sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently sediment transport, transported by the action of wind, water, or ice or by the force of gravity acting on the particles. ...

sediment
s, deepening the river and decreasing the possibility of flooding. The 1927 flood proved this to be so wrong that communities threatened by the flood began to create their own levee breaks to relieve the force of the rising river. The Rivers and Harbors Act of 1930 authorized the channel project, which called for a navigation channel feet deep and wide to accommodate multiple-barge tows. This was achieved by a series of locks and dams, and by dredging. Twenty-three new locks and dams were built on the upper Mississippi in the 1930s in addition to the three already in existence. Until the 1950s, there was no dam below Lock and Dam 26 at Alton, Illinois. Chain of Rocks Lock (Lock and Dam No. 27), which consists of a low-water dam and an canal, was added in 1953, just below the confluence with the Missouri River, primarily to bypass a series of rock ledges at St. Louis. It also serves to protect the St. Louis city water intakes during times of low water. U.S. government scientists determined in the 1950s that the Mississippi River was starting to switch to the Atchafalaya River channel because of its much steeper path to the Gulf of Mexico. Eventually, the Atchafalaya River would capture the Mississippi River and become its main channel to the Gulf of Mexico, leaving New Orleans on a side channel. As a result, the United States Congress, U.S. Congress authorized a project called the
Old River Control Structure Old River Control Structure discharging water into the Atchafalaya, May 2011 The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into ...
, which has prevented the Mississippi River from leaving its current channel that drains into the Gulf via New Orleans. Because the large scale of high-energy water flow threatened to damage the structure, an auxiliary flow control station was built adjacent to the standing control station. This $300 million project was completed in 1986 by the Corps of Engineers. Beginning in the 1970s, the Corps applied hydrological transport models to analyze flood flow and water quality of the Mississippi. Dam 26 at Alton, Illinois, which had structural problems, was replaced by the Mel Price Lock and Dam in 1990. The original Lock and Dam 26 was demolished.


21st century

The Corps now actively creates and maintains spillways and floodways to divert periodic water surges into backwater channels and lakes, as well as route part of the Mississippi's flow into the Atchafalaya Basin and from there to the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin 400px, Diagrammatic cross-section of an ocean basin, showing the various geographic features In hydrology Hydrology (from Greek: wikt:ὕδωρ, ὕδωρ, "hýdōr" meaning ...

Gulf of Mexico
, bypassing
Baton Rouge Baton Rouge ( ; ) is the capital city of the U.S. state of Louisiana. On the eastern bank of the Mississippi River, it is the county seat, parish seat of East Baton Rouge Parish, Louisiana, East Baton Rouge Parish, the most-populous List of par ...

Baton Rouge
and
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
. The main structures are the Birds Point-New Madrid Floodway in Missouri; the
Old River Control Structure Old River Control Structure discharging water into the Atchafalaya, May 2011 The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into ...
and the Morganza Spillway in Louisiana, which direct excess water down the west and east sides (respectively) of the
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
; and the Bonnet Carré Spillway, also in Louisiana, which directs floodwaters to Lake Pontchartrain (see diagram). Some experts blame urban sprawl for increases in both the risk and frequency of flooding on the Mississippi River. Some of the pre-1927 strategy remains in use today, with the Corps actively cutting the necks of meander, horseshoe bends, allowing the water to move faster and reducing flood heights.


History

Approximately 50,000 years ago, the Central United States was covered by an inland sea, which was drained by the Mississippi and its tributaries into the Gulf of Mexico—creating large floodplains and extending the continent further to the south in the process. The soil in areas such as Louisiana was thereafter found to be very rich.


Native Americans

The area of the Mississippi River basin was first Prehistoric migration and settlement of the Americas from Asia, settled by Hunter-gatherer, hunting and gathering Native Americans in the United States, Native American peoples and is considered one of the few independent centers of Domestication of plants, plant domestication in human history. Evidence of early Plant cultivation, cultivation of Helianthus annuus, sunflower, a Chenopodium berlandieri, goosefoot, a Iva annua, marsh elder and an indigenous squash (plant), squash dates to the 4th millennium BC. The lifestyle gradually became more settled after around 1000 BC during what is now called the Woodland period, with increasing evidence of shelter construction, Ceramics of indigenous peoples of the Americas, pottery, weaving and other practices. A network of trade routes referred to as the Hopewell tradition, Hopewell interaction sphere was active along the waterways between about 200 and 500 AD, spreading common cultural practices over the entire area between the Gulf of Mexico and the Great Lakes. A period of more isolated communities followed, and agriculture introduced from Mesoamerica based on the Three Sisters (agriculture), Three Sisters (maize, beans and squash) gradually came to dominate. After around 800 AD there arose an advanced agricultural society today referred to as the Mississippian culture, with evidence of highly Social stratification, stratified complex society, complex chiefdoms and large human settlement, population centers. The most prominent of these, now called Cahokia, was occupied between about 600 and 1400 AD and at its peak numbered between 8,000 and 40,000 inhabitants, larger than London, England of that time. At the time of first contact with Europeans, Cahokia and many other Mississippian cities had dispersed, and archaeology, archaeological finds attest to increased social stress. Modern American Indian nations inhabiting the Mississippi basin include Cheyenne, Sioux, Ojibwe, Potawatomi, Ho-Chunk, Fox (tribe), Fox, Kickapoo people, Kickapoo, Tamaroa (tribe), Tamaroa, Moingwena, Quapaw and Chickasaw. The word ''Mississippi'' itself comes from ''Messipi'', the French rendering of the Ojibwe language, Anishinaabe (Ojibwe or Algonquin) name for the river, ''Misi-ziibi'' (Great River). The Ojibwe called Lake Itasca ''Omashkoozo-zaaga'igan'' (Elk Lake) and the river flowing out of it ''Omashkoozo-ziibi'' (Elk River). After flowing into Lake Bemidji, the Ojibwe called the river ''Bemijigamaag-ziibi'' (River from the Traversing Lake). After flowing into Cass Lake (Minnesota), Cass Lake, the name of the river changes to ''Gaa-miskwaawaakokaag-ziibi'' (Red Cedar River) and then out of
Lake Winnibigoshish Lake Winnibigoshish is a body of water in north central Minnesota, in the Chippewa National Forest. Its name comes from the Ojibwe language ''Wiinibiigoonzhish'', a diminutive and pejorative form of ''Wiinibiig'', meaning "filthy water" (i.e., "bra ...
as ''Wiinibiigoonzhish-ziibi'' (Miserable Wretched Dirty Water River), ''Gichi-ziibi'' (Big River) after the confluence with the Leech Lake River, then finally as ''Misi-ziibi'' (Great River) after the confluence with the Crow Wing River. After the expeditions by Giacomo Beltrami and Henry Schoolcraft, the longest stream above the juncture of the Crow Wing River and ''Gichi-ziibi'' was named "Mississippi River". The Mississippi River Band of Chippewa Indians, known as the ''Gichi-ziibiwininiwag'', are named after the stretch of the Mississippi River known as the ''Gichi-ziibi''. The Cheyenne, one of the earliest inhabitants of the upper Mississippi River, called it the ''Máʼxe-éʼometaaʼe'' (Big Greasy River) in the Cheyenne language. The Arapaho language, Arapaho name for the river is ''Beesniicíe''. The Pawnee language, Pawnee name is ''Kickaátit''. The Mississippi was spelled during French Louisiana and was also known as the Rivière Saint-Louis.


European exploration

In 1519 Spanish explorer Alonso Álvarez de Pineda became the first recorded European to reach the Mississippi River, followed by Hernando de Soto who reached the river on May 8, 1541, and called it ''Río del Espíritu Santo'' ("River of the Holy Spirit"), in the area of what is now Mississippi. In Spanish, the river is called ''Río Mississippi''. French explorers Louis Jolliet and Jacques Marquette began exploring the Mississippi in the 17th century. Marquette traveled with a Sioux Indian who named it ''Ne Tongo'' ("Big river" in Sioux language) in 1673. Marquette proposed calling it the ''River of the Immaculate Conception''. When Louis Jolliet explored the Mississippi Valley in the 17th century, natives guided him to a quicker way to return to French Canada via the Illinois River. When he found the Chicago Portage, he remarked that a canal of "only half a League (unit), league" (less than ) would join the Mississippi and the Great Lakes. In 1848, the continental divide separating the waters of the Great Lakes and the Mississippi Valley was breached by the Illinois and Michigan canal via the Chicago River. This both accelerated the development, and forever changed the ecology of the Mississippi Valley and the Great Lakes. In 1682, René-Robert Cavelier, Sieur de La Salle and Henri de Tonti claimed the entire Mississippi River Valley for France, calling the river ''Colbert River'' after Jean-Baptiste Colbert and the region ''Louisiana (New France), La Louisiane'', for Louis XIV of France, King Louis XIV. On March 2, 1699, Pierre Le Moyne d'Iberville rediscovered the mouth of the Mississippi, following the death of La Salle."Pierre Le Moyne, Sieur d'Iberville" (bio), webpage from ''The Catholic Encyclopedia'', Volume VII, 1910, New York
CathEn-07614b
.
The French built the small fort of La Balize, Louisiana, La Balise there to control passage. In 1718, about upriver, New Orleans was established along the river crescent by Jean-Baptiste Le Moyne, Sieur de Bienville, with construction patterned after the 1711 resettlement on Mobile Bay of Mobile, Alabama, Mobile, the capital of French Louisiana at the time. In 1727, Étienne Perier (governor), Étienne Perier begins work, using enslaved African laborers, on the first
levee file:River Levee Cross Section Figure.svg, Components of a levee: file:Sacramento River Levee.jpg, The side of a levee in Sacramento, California A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop ...

levee
s on the Mississippi River.


Colonization

Following Great Britain in the Seven Years War, Britain's victory in the Seven Years War the Mississippi became the border between the British and Spanish Empires. The Treaty of Paris (1763) gave Kingdom of Great Britain, Great Britain rights to all land east of the Mississippi and Spain rights to land west of the Mississippi. Spain also ceded Spanish Florida, Florida to Britain to regain Cuba, which the British occupied during the war. Britain then divided the territory into East Florida, East and West Florida. Article 8 of the Treaty of Paris (1783) states, "The navigation of the river Mississippi, from its source to the ocean, shall forever remain free and open to the subjects of Great Britain and the citizens of the United States". With this treaty, which ended the American Revolutionary War, Britain also ceded West Florida back to Spain to regain the Bahamas, which Spain had occupied during the war. Initial disputes around the ensuing claims of the U.S. and Spain were resolved when Spain was pressured into signing Pinckney's Treaty in 1795. However, in 1800, under duress from Napoleon of France, Spain ceded an undefined portion of West Florida to France in the secret Third Treaty of San Ildefonso, Treaty of San Ildefonso. The United States then secured effective control of the river when it bought the Louisiana Territory from France in the Louisiana Purchase of 1803. This triggered a dispute between Spain and the U.S. on which parts of West Florida Spain had ceded to France in the first place, which would, in turn, decide which parts of West Florida the U.S. had bought from France in the Louisiana Purchase, versus which were unceded Spanish property. Following ongoing U.S. colonization creating facts on the ground, and U.S. military actions, Spain ceded both West Florida and East Florida in their entirety to the United States in the Adams–Onís Treaty of 1819. The last serious European challenge to U.S. control of the river came at the conclusion of War of 1812 when British forces mounted an attack on
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
– the attack Battle of New Orleans, was repulsed by an American army under the command of General Andrew Jackson. In the Treaty of 1818, the U.S. and Great Britain agreed to fix the border running from the Lake of the Woods to the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with simila ...

Rocky Mountains
along the 49th parallel north. In effect, the U.S. ceded the northwestern extremity of the Mississippi basin to the British in exchange for the southern portion of the Red River of the North, Red River basin. So many settlers traveled westward through the Mississippi river basin, as well as settled in it, that Zadok Cramer wrote a guide book called ''The Navigator (1801 guide book), The Navigator'', detailing the features and dangers and navigable waterways of the area. It was so popular that he updated and expanded it through 12 editions over a period of 25 years. The colonization of the area was barely slowed by the three 1812 New Madrid earthquake, earthquakes in 1811 and 1812, estimated at approximately 8 on the Richter magnitude scale, that were centered near New Madrid, Missouri.


Steamboat era

Mark Twain's book, ''Life on the Mississippi'', covered the steamboat commerce which took place from 1830 to 1870 on the river before more modern ships replaced the steamer. The book was published first in serial form in ''Harper's Weekly'' in seven parts in 1875. The full version, including a passage from the then unfinished ''Adventures of Huckleberry Finn'' and works from other authors, was published by James R. Osgood & Company in 1885. The first steamboat to travel the full length of the Lower Mississippi from the Ohio River to New Orleans was the ''New Orleans (steamboat), New Orleans'' in December 1811. Its maiden voyage occurred during the series of 1812 New Madrid earthquake, New Madrid earthquakes in 1811–12. The Upper Mississippi was treacherous, unpredictable and to make traveling worse, the area was not properly mapped out or surveyed. Until the 1840s, only two trips a year to the Twin Cities landings were made by steamboats which suggests it was not very profitable. Steamboat transport remained a viable industry, both in terms of passengers and freight until the end of the first decade of the 20th century. Among the several Mississippi River system steamboat companies was the noted Anchor Line (riverboat company), Anchor Line, which, from 1859 to 1898, operated a luxurious fleet of steamers between St. Louis and New Orleans. Italian explorer Giacomo Beltrami, wrote about his journey on the ''Virginia'', which was the first steamboat to make it to Fort St. Anthony in Minnesota. He referred to his voyage as a promenade that was once a journey on the Mississippi. The steamboat era changed the economic and political life of the Mississippi, as well as the nature of travel itself. The Mississippi was completely changed by the steamboat era as it transformed into a flourishing tourist trade.


Civil War

Control of the river was a strategic objective of both sides in the
American Civil War The American Civil War (also known by Names of the American Civil War, other names) was a civil war in the United States from 1861 to 1865, fought between northern U.S. state, states loyal to the Union (American Civil War), Union and sout ...
, forming a part of the U.S. Anaconda Plan. In 1862 Union forces coming down the river successfully cleared Confederate defenses at Battle of Island Number Ten, Island Number 10 and Memphis, Tennessee, while Naval forces coming upriver from the Gulf of Mexico captured New Orleans, Louisiana. The remaining major Confederate stronghold was on the heights overlooking the river at
Vicksburg, Mississippi Vicksburg is a historic city in Warren County, Mississippi Warren County is a County (United States), county located in the U.S. state of Mississippi. As of the 2010 United States Census, 2010 census, the population was 48,773. Its county ...
, and the Union's Vicksburg Campaign (December 1862 to July 1863), and the fall of Port Hudson, Louisiana, Port Hudson, completed control of the lower Mississippi River. The Union victory ending the Siege of Vicksburg on July 4, 1863, was pivotal to the Union's final victory of the Civil War.


20th and 21st centuries

The "Big Freeze" of 1918–19 blocked river traffic north of Memphis, Tennessee, preventing transportation of coal from southern Illinois. This resulted in widespread shortages, high prices, and rationing of coal in January and February. In the spring of 1927, the river broke out of its banks in 145 places, during the Great Mississippi Flood of 1927 and inundated to a depth of up to . In 1930, Fred Newton (swimmer), Fred Newton was the first person to swim the length of the river, from Minneapolis to New Orleans. The journey took 176 days and covered 1,836 miles. In 1962 and 1963, industrial accidents spilled of soybean oil into the Mississippi and Minnesota River, Minnesota rivers. The oil covered the Mississippi River from St. Paul to Lake Pepin, creating an ecological disaster and a demand to control water pollution. On October 20, 1976, the automobile ferry, ''MV George Prince ferry disaster, MV George Prince'', was struck by a ship traveling upstream as the ferry attempted to cross from Destrehan, Louisiana, to Luling, Louisiana. Seventy-eight passengers and crew died; only eighteen survived the accident. In 1988, the water level of the Mississippi fell to below zero on the Memphis gauge. The remains of wooden-hulled water craft were exposed in an area of on the bottom of the Mississippi River at West Memphis, Arkansas. They dated to the late 19th to early 20th centuries. The State of Arkansas, the Arkansas Archeological Survey, and the Arkansas Archeological Society responded with a two-month data recovery effort. The fieldwork received national media attention as good news in the middle of a drought. The Great Mississippi and Missouri Rivers Flood of 1993, Great Flood of 1993 was another significant flood, primarily affecting the Mississippi above its confluence with the Ohio River at Cairo, Illinois. Two portions of the Mississippi were designated as American Heritage Rivers in 1997: the lower portion around Louisiana and Tennessee, and the upper portion around Iowa, Illinois, Minnesota, Missouri and Wisconsin. The Nature Conservancy's project called "America's Rivershed Initiative" announced a 'report card' assessment of the entire basin in October 2015 and gave the grade of D+. The assessment noted the aging navigation and flood control infrastructure along with multiple environmental problems. In 2002, Slovenian long-distance swimmer Martin Strel swam the entire length of the river, from Minnesota to Louisiana, over the course of 68 days. In 2005, the Source to Sea Expedition paddled the Mississippi and
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
s to benefit the Audubon Society's Upper Mississippi River Campaign.


Future

Geologists believe that the lower Mississippi could take a new course to the Gulf. Either of two new routes—through the Atchafalaya Basin or through Lake Pontchartrain—might become the Mississippi's main channel if flood-control structures are overtopped or heavily damaged during a severe flood. Failure of the
Old River Control Structure Old River Control Structure discharging water into the Atchafalaya, May 2011 The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into ...
, the Morganza Spillway, or nearby levees would likely re-route the main channel of the Mississippi through
Louisiana Louisiana (Standard French Standard French (in French: ''le français standard'', ''le français normé'', ''le français neutre'' eutral Frenchor ''le français international'' nternational French is an unofficial term for a standard ...

Louisiana
's Atchafalaya Basin and down the
Atchafalaya River The Atchafalaya River ( french: Atchafalaya Rivière, es, Río Atchafalaya) is a distributary A distributary, or a distributary channel, is a stream that branches off and flows away from a main stream channel. Distributaries are a common fea ...

Atchafalaya River
to reach the Gulf of Mexico south of Morgan City, Louisiana, Morgan City in southern Louisiana. This route provides a more direct path to the
Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin 400px, Diagrammatic cross-section of an ocean basin, showing the various geographic features In hydrology Hydrology (from Greek: wikt:ὕδωρ, ὕδωρ, "hýdōr" meaning ...

Gulf of Mexico
than the present Mississippi River channel through Baton Rouge, Louisiana, Baton Rouge and
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
. While the risk of such a diversion is present during any major flood event, such a change has so far been prevented by active human intervention involving the construction, maintenance, and operation of various levees, spillways, and other control structures by the U.S. Army Corps of Engineers. The Old River Control Structure, between the present Mississippi River channel and the Atchafalaya Basin, sits at the normal water elevation and is ordinarily used to divert 30% of the Mississippi's flow to the Atchafalaya River. There is a steep drop here away from the Mississippi's main channel into the Atchafalaya Basin. If this facility were to fail during a major flood, there is a strong concern the water would Bridge scour, scour and erode the river bottom enough to capture the Mississippi's main channel. The structure was nearly lost during the 1973 Mississippi River floods, 1973 flood, but repairs and improvements were made after engineers studied the forces at play. In particular, the Corps of Engineers made many improvements and constructed additional facilities for routing water through the vicinity. These additional facilities give the Corps much more flexibility and potential flow capacity than they had in 1973, which further reduces the risk of a catastrophic failure in this area during other major floods, such as that of 2011 Mississippi River floods, 2011. Because the Morganza Spillway is slightly higher and well back from the river, it is normally dry on both sides. Even if it failed at the crest during a severe flood, the floodwaters would have to erode to normal water levels before the Mississippi could permanently jump channel at this location. During the 2011 floods, the Corps of Engineers opened the Morganza Spillway to 1/4 of its capacity to allow of water to flood the Morganza and Atchafalaya floodways and continue directly to the Gulf of Mexico, bypassing Baton Rouge and New Orleans.Estimated Inundation
(US Army Corps of Engineers)
In addition to reducing the Mississippi River crest downstream, this diversion reduced the chances of a channel change by reducing stress on the other elements of the control system. Some geologists have noted that the possibility for course change into the Atchafalaya also exists in the area immediately north of the Old River Control Structure. Army Corps of Engineers geologist Fred Smith once stated, "The Mississippi wants to go west. 1973 was a forty-year flood. The big one lies out there somewhere—when the structures can't release all the floodwaters and the levee is going to have to give way. That is when the river's going to jump its banks and try to break through." Another possible course change for the Mississippi River is a diversion into Lake Pontchartrain near
New Orleans New Orleans (,New Orleans
Merriam-Webster.
; french: La Nouvelle-Orléans ) is a Consolidat ...

New Orleans
. This route is controlled by the Bonnet Carré Spillway, built to reduce flooding in New Orleans. This spillway and an imperfect natural levee about 4–6 meters (12 to 20 feet) high are all that prevents the Mississippi from taking a new, shorter course through Lake Pontchartrain to the Gulf of Mexico. Diversion of the Mississippi's main channel through Lake Pontchartrain would have consequences similar to an Atchafalaya diversion, but to a lesser extent, since the present river channel would remain in use past Baton Rouge and into the New Orleans area.


Recreation

The sport of waterskiing, water skiing was invented on the river in a wide region between Minnesota and Wisconsin known as
Lake Pepin Lake Pepin is a naturally occurring lake on the Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorpholo ...
. Ralph Samuelson of Lake City, Minnesota, created and refined his skiing technique in late June and early July 1922. He later performed the first water ski jump in 1925 and was pulled along at by a Curtiss flying boat later that year. There are seven National Park Service sites along the Mississippi River. The Mississippi National River and Recreation Area is the National Park Service site dedicated to protecting and interpreting the Mississippi River itself. The other six National Park Service sites along the river are (listed from north to south): * Effigy Mounds National Monument * Gateway Arch National Park (includes
Gateway Arch The Gateway Arch is a monument in St. Louis, Missouri, United States. Clad in stainless steel and built in the form of a weighted catenary Catenary arch, arch, it is the world's tallest arch and List of tallest buildings in Missouri, Missouri's ...

Gateway Arch
) * Vicksburg National Military Park * Natchez National Historical Park * New Orleans Jazz National Historical Park * Jean Lafitte National Historical Park and Preserve


Ecology

The Mississippi basin is home to a highly diverse aquatic fauna and has been called the "mother fauna" of North American fresh water.


Fish

About 375 fish species are known from the Mississippi basin, far exceeding other North Hemisphere river basins exclusively within temperate/subtropical regions, except the Yangtze. Within the Mississippi basin, streams that have their source in the Appalachian and Ozark highlands contain especially many species. Among the fish species in the basin are numerous endemics, as well as Relict (biology), relicts such as American paddlefish, paddlefish, sturgeon, gar and bowfin. Because of its size and high species diversity, the Mississippi basin is often divided into subregions. The Upper Mississippi River alone is home to about 120 fish species, including walleye, sauger, large mouth bass, small mouth bass, white bass, northern pike, bluegill, crappie, channel catfish, flathead catfish, common shiner, freshwater drum and shovelnose sturgeon.


Other fauna

In addition to fish, several species of turtles (such as Common snapping turtle, snapping, Sternotherus, musk, Kinosternon, mud, Graptemys, map, Pseudemys, cooter, Painted turtle, painted and Apalone, softshell turtles), American alligator, aquatic amphibians (such as hellbender, mudpuppy, three-toed amphiuma and lesser siren), and Cambaridae, cambarid crayfish (such as the red swamp crayfish) are native to the Mississippi basin.


Introduced species

Numerous introduced species are found in the Mississippi and some of these are Invasive species, invasive. Among the introductions are fish such as
Asian carp Several species In biology, a species is the basic unit of biological classification, classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms i ...
, including the silver carp that have become infamous for out-competing native fish and their potentially dangerous Asian carp in North America#Jumping ability, jumping behavior. They have spread throughout much of the basin, even approaching (but not yet invading) the Great Lakes. The Minnesota Department of Natural Resources has designated much of the Mississippi River in the state as infested waters by the exotic species zebra mussels and Eurasian watermilfoil.


See also

* Atchafalaya Basin * Capes on the Mississippi River * Chemetco * Great River Road * List of crossings of the Lower Mississippi River * List of crossings of the Upper Mississippi River * List of locks and dams of the Upper Mississippi River * List of longest rivers of the United States (by main stem) *
Mississippi embayment The Mississippi Embayment is a physiographic feature in the south-central United States The United States of America (USA), commonly known as the United States (U.S. or US), or America, is a country Contiguous United States, primarily l ...
* Mississippi River floods * Mississippi River System * ''The Waterways Journal Weekly'' * Upper Mississippi River National Wildlife and Fish Refuge


Notes


References


Further reading

* Ambrose, Stephen. ''The Mississippi and the Making of a Nation: From the Louisiana Purchase to Today'' (National Geographical Society, 2002) heavily illustrated * * Anfinson, John Ogden. ''Commerce and conservation on the Upper Mississippi River'' (US Army Corps of Engineers, St. Paul District, 1994) * * Botkin, Benjamin Albert. ''A Treasury of Mississippi River folklore: stories, ballads & traditions of the mid-American river country'' (1984). * Carlander, Harriet Bell. ''A history of fish and fishing in the upper Mississippi River'' (PhD Diss. Iowa State College, 1954
online
(PDF) * Daniel, Pete. ''Deep'n as it come: The 1927 Mississippi River flood'' (University of Arkansas Press, 1977) * Fremling, Calvin R. ''Immortal river: the Upper Mississippi in ancient and modern times'' (U. of Wisconsin Press, 2005), popular history * Milner, George R. "The late prehistoric Cahokia cultural system of the Mississippi River valley: Foundations, florescence, and fragmentation." ''Journal of World Prehistory'' (1990) 4#1 pp: 1–43. * Morris, Christopher. ''The Big Muddy: An Environmental History of the Mississippi and Its Peoples From Hernando de Soto to Hurricane Katrina'' (Oxford University Press; 2012) 300 pages; links drought, disease, and flooding to the impact of centuries of increasingly intense human manipulation of the river. * * * *


External links


Mississippi River
project of the American Land Conservancy
Flood management in the Mississippi River

Friends of the Mississippi River
*
Mississippi River Challengeannual canoe & kayak event on the Twin Cities stretch
*
Mississippi River Field Guide
{{Authority control Mississippi River, Mississippi River watershed, . American Heritage Rivers Borders of Arkansas Borders of Illinois Borders of Iowa Borders of Kentucky Borders of Louisiana Borders of Minnesota Borders of Mississippi Borders of Missouri Borders of Tennessee Borders of Wisconsin Rivers of Arkansas Rivers of Illinois Rivers of Iowa Rivers of Kentucky Rivers of Louisiana Rivers of Minnesota Rivers of Mississippi Rivers of Missouri Rivers of Tennessee Rivers of Wisconsin Mississippi embayment