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The Missouri River Valley outlines the journey of the Missouri River from its
headwater The headwaters of a river or stream is the farthest place in that river or stream from its estuary or downstream confluence with another river, as measured along the course of the river. It is also known as a river's source. Definition The ...
s where the Madison, Jefferson and Gallatin Rivers flow together in
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Colum ...
to its
confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...
with the
Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it fl ...
in the
State of Missouri Missouri is a state in the Midwestern region of the United States. Ranking 21st in land area, it is bordered by eight states (tied for the most with Tennessee): Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas to t ...
. At long the valley drains one-sixth of the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territo ...
, and is the longest
river valley A valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over ...
on the
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the C ...
n continent. The valley in the Missouri River basin includes river bottoms and
floodplain A floodplain or flood plain or bottomlands is an area of land adjacent to a river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge.Goudi ...
s.


Geography

The Missouri's valley ranges from to wide from edge to edge, with gentle slopes from the adjacent upland to the valley floor. Other segments are narrow, less than two miles (3 km) wide, with rugged valley sides. Generally, the wide segments trend west-east and the narrow segments trend north-south. Starting in the state of
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Colum ...
, the Missouri River Valley travels through
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the indigenous Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minnesota to the east, South ...
,
South Dakota South Dakota (; Sioux: , ) is a U.S. state in the North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota and Dakota Sioux Native American tribes, who comprise a large portion ...
, forms the shared border of eastern
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...
and western
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 ...
, goes into
Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the w ...
and then eastward through the state of
Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
. The valley travels through several distinct
ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of l ...
s with distinct climate, geology and native species. The
Loess Hills The Loess Hills are a formation of wind-deposited loess soil in the westernmost parts of Iowa and Missouri, and the easternmost parts of Nebraska and Kansas, along the Missouri River. Geology The Loess (, , or ) Hills are generally located bet ...
are a unique geographic feature of the valley.
Loess Loess (, ; from german: Löss ) is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. Ten percent of Earth's land area is covered by loess or similar deposits. Loess is a periglacial or aeolian ...
, a wind-deposited soil, is compounded in slowly rising hills at various points in extreme eastern portions of Nebraska and Kansas along the Missouri River Valley, particularly near the Nebraska cities of Brownville, Rulo, Plattsmouth, Fort Calhoun, and
Ponca The Ponca ( Páⁿka iyé: Páⁿka or Ppáⁿkka pronounced ) are a Midwestern Native American tribe of the Dhegihan branch of the Siouan language group. There are two federally recognized Ponca tribes: the Ponca Tribe of Nebraska and the Pon ...
, rising no more than above the Missouri River bottoms. The majority of these hills stretch along the east side of the river, from
Westfield, Iowa Westfield is a city in Plymouth County, Iowa, United States. The population was 123 at the time of the 2020 census. It is the westernmost point in Iowa, this being due to a bend in the Big Sioux River. The nearby Broken Kettle wildlife refuge ...
in the north to Mound City, Missouri in the south.


Flooding

Channeling and levee construction have altered how floods affect the Missouri River Valley. Several large floods have affected the valley since Europeans first came into the area. The first recorded event is the
Great Flood of 1844 The Great Flood of 1844 is the biggest flood ever recorded on the Missouri River and Upper Mississippi River, in North America, in terms of discharge. The adjusted economic impact was not as great as subsequent floods because of the small populatio ...
, which crested in
Kansas City The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri (9 counties) and Kansas (5 counties). With and a population of more ...
on July 16, 1844, discharged per second. The
Great Flood of 1951 In mid-July 1951, heavy rains led to a great rise of water in the Kansas River, Missouri River, and other surrounding areas of the Central United States. Flooding occurred in the Kansas, Neosho, Marais Des Cygnes, and Verdigris river basins. ...
discharged per second, cresting on July 14, 1951. This flood devastated the lower Missouri River Valley, including Kansas City, along a reach of river where there was no
levee A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop bank is a structure that is usually earthen and that often runs parallel to the course of a river in its floodplain or along low-lying coastlin ...
system. The Kansas City Stockyards were destroyed and the city was forced to move the development of an airport away from the Missouri River bottoms. The
Great Flood of 1993 The Great Flood of 1993 (or Great Mississippi and Missouri Rivers Flood of 1993) was a flood that occurred in the Midwestern United States, along the Mississippi and Missouri rivers and their tributaries, from April to October 1993. The flood wa ...
discharged at per second and devastated much of the upper valley.


Culture

The Missouri River Valley Culture, or "Steamboat Society," was first defined in the 1850s by non-Indian residents of the Dakotas who sold wood to steamboats or trapped furs along the river bottoms. Gambling, prostitution and illegal alcohol sales to American Indians fueled the growth of the culture, which eventually included
outfitter An outfitter is a shop or person that sells specialized clothes (an '' outfit'' is a set of clothing). More specifically, it is a company or individual who provides or deals in equipment and supplies for the pursuit of certain activities. In North ...
s, livestock ranchers and tribal agents. A line of urbanized centers grew along the river in response which bloomed when reservations were allotted throughout the region. Uniting themselves along the banks of the river, South Dakotans identify themselves even today as "East River" or "West River". According to the
University of South Dakota The University of South Dakota (USD) is a public research university in Vermillion, South Dakota. Established by the Dakota Territory legislature in 1862, 27 years before the establishment of the state of South Dakota, USD is the flagship univ ...
, the associated present-day culture of the Missouri River Valley contains a broad swath of political, social, historic, and artistic perspectives.


Management

The
Flood Control Act of 1944 The Pick-Sloan Flood Control Act of 1944 (P.L. 78–534), enacted in the 2nd session of the 78th Congress, is U.S. legislation that authorized the construction of numerous dams and modifications to previously existing dams, as well as levees acro ...
introduced the Pick-Sloan Missouri Basin Program. Designed to benefit the entirety of the Missouri River Basin including the valley, the plan sought to meet the needs of residents throughout the area by providing
irrigation system Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been develo ...
s and
reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including control ...
s for storing water where needed, along with hydroelectric power,
flood control Flood control methods are used to reduce or prevent the detrimental effects of flood waters."Flood Control", MSN Encarta, 2008 (see below: Further reading). Flood relief methods are used to reduce the effects of flood waters or high water levels ...
measures, and navigational improvement. The government did not complete the comprehensive plan for the valley, instead introducing individual projects, including the construction of six dams. They are the
Fort Peck Dam The Fort Peck Dam is the highest of six major dams along the Missouri River, located in northeast Montana in the United States, near Glasgow, and adjacent to the community of Fort Peck. At in length and over in height, it is the largest hyd ...
in Montana, the
Garrison Dam Garrison Dam is an earth-fill embankment dam on the Missouri River in central North Dakota, U.S. Constructed by the U.S. Army Corps of Engineers from 1947 to 1953, at over in length, the dam is the fifth-largest earthen dam in the world. The r ...
in North Dakota, the Oahe, Big Bend, and
Fort Randall Dam Fort Randall Dam is a earthen dam which spans the Missouri River and impounds Lake Francis Case, the 11th-largest reservoir in the U.S. The dam joins Gregory and Charles Mix counties, South Dakota a distance of 880 river miles (1,416 km ...
s in South Dakota, and the
Gavins Point Dam Gavins Point Dam is a long embankment rolled-earth and chalk-fill dam which spans the Missouri River and impounds Lewis and Clark Lake. The dam joins Cedar County, Nebraska with Yankton County, South Dakota a distance of 811.1 river miles ( ...
in Nebraska and South Dakota. The channel of the Missouri was also improved extensively along with the development of ports such as the one in Omaha throughout the 1950s and 60s for greater volumes of traffic on the river, which have never come to fruition."United States Geography"
MSN Encarta. Retrieved 2/5/08

2009-11-01.


Protected areas

Following at a distance of years the first recorded exploration of the majority of the valley by the
Lewis and Clark Expedition The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition, was the United States expedition to cross the newly acquired western portion of the country after the Louisiana Purchase. The Corps of Discovery was a select gro ...
(1804–1806), there have been numerous attempts at preserving the natural habitats of the Missouri River Valley, spurred in its early days by concerns of duck hunters, for the Missouri basin lies across a major migration toutes, the
Central Flyway The Central Flyway is a bird migration route that generally follows the Great Plains in the United States and Canada. The main endpoints of the flyway include the Canadian Prairies and the region surrounding the Gulf of Mexico; the migration rout ...
, and in the river's lower reaches, the
Mississippi Flyway The Mississippi Flyway is a bird migration route that generally follows the Mississippi, Missouri, and Lower Ohio Rivers in the United States across the western Great Lakes to the Mackenzie River and Hudson Bay in Canada. The main endpoints of t ...
. Today there are several
protected area Protected areas or conservation areas are locations which receive protection because of their recognized natural, ecological or cultural values. There are several kinds of protected areas, which vary by level of protection depending on the ena ...
s throughout the course of the Missouri River Valley. They include the
Theodore Roosevelt National Park Theodore Roosevelt National Park is an American national park of the badlands in western North Dakota comprising three geographically separated areas. Honoring U.S. President Theodore Roosevelt, it is the only American national park named direct ...
,
Mark Twain National Forest Mark Twain National Forest (MTNF) is a U.S. National Forest located in the southern half of Missouri. MTNF was established on September 11, 1939. It is named for author Mark Twain, a Missouri native. The MTNF covers of which is public owned, ...
in Missouri and the DeSoto National Wildlife Refuge in Nebraska. The Katy Trail travels along the valley in Missouri. Other protected areas in the valley include: * Boyer Chute National Wildlife Refuge * Charles M. Russell National Wildlife Refuge *
Lake Sakakawea Lake Sakakawea is a large reservoir in the north central United States, impounded in 1953 by Garrison Dam, a U.S. Army Corps of Engineers dam located in the Missouri River basin in central North Dakota. Named for the Shoshone-Hidatsa woman Sa ...
* Missouri Headwaters State Park * Ponca State Park * Upper Missouri River Breaks National Monument


See also

* Tributaries of the Missouri River (category) * Ionia Volcano *
Little Dixie (Missouri) Little Dixie is a historic 13- to 17-county region along the Missouri River in central Missouri, United States. Its early Anglo-American settlers were largely migrants from the hemp and tobacco districts of Virginia, Kentucky, and Tennessee. They ...
* River basins in the United States


References


External links


Missouri River Valley Explorer
{{Authority control Missouri River River valleys of the United States Valleys of North Dakota Valleys of Missouri Geography of Omaha, Nebraska