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Delaware Bay is the
estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime enviro ...
outlet of the
Delaware River The Delaware River is a major river in the Mid-Atlantic region of the United States and is the longest free-flowing (undammed) river in the Eastern United States. From the meeting of its branches in Hancock, New York, the river flows for a ...
on the northeast seaboard of the United States, lying between the states of
Delaware Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
and
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
. It is approximately in area, the bay's freshwater mixes for many miles with the saltwater of the
Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...
. The bay is bordered inland by the states of
Delaware Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
and
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
, and its mouth is framed by
Cape Henlopen Cape Henlopen is the southern cape of the Delaware Bay along the Atlantic coast of the United States. It lies in the state of Delaware, near the town of Lewes, where the Delaware Bay meets the Atlantic Ocean. Off the coast on the bay side are two ...
in Delaware and
Cape May Cape May consists of a peninsula and barrier island system in the U.S. state of New Jersey. It is roughly coterminous with Cape May County and runs southwards from the New Jersey mainland, separating Delaware Bay from the Atlantic Ocean. Th ...
in New Jersey, on the Atlantic. Delaware Bay is bordered by six counties: Sussex, Kent, and New Castle in Delaware, and Cape May, Cumberland, and Salem in New Jersey. The
Cape May–Lewes Ferry The Cape May–Lewes Ferry is a ferry system on the East Coast of the United States that traverses a crossing of the Delaware Bay connecting North Cape May, New Jersey with Lewes, Delaware. The ferry constitutes a portion of U.S. Route 9 and ...
crosses Delaware Bay from
North Cape May, New Jersey North Cape May is an unincorporated community and census-designated place (CDP) located within Lower Township in Cape May County, in the U.S. state of New Jersey. It is part of the Ocean City Metropolitan Statistical Area. At the 2010 United ...
, to
Lewes, Delaware Lewes ( ) is an incorporated city on the Delaware Bay in eastern Sussex County, Delaware, United States. According to the 2020 census, its population was 3,303. Along with neighboring Rehoboth Beach, Lewes is one of the principal cities of Del ...
. The bay's ports are managed by the
Delaware River and Bay Authority The Delaware River and Bay Authority (DRBA) is a bi-state government agency of the United States, U.S. states of Delaware and New Jersey established by an interstate compact in 1962. The authority operates the Delaware Memorial Bridge, Delaw ...
. The shores of the bay are largely composed of
salt marsh A salt marsh, saltmarsh or salting, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open saltwater or brackish water that is regularly flooded by the tides. I ...
es and
mudflats Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal ...
, with only small communities inhabiting the shore of the lower bay. Several of the rivers hold protected status for their salt marsh
wetlands A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor ( anoxic) processes taking place, especially ...
bordering the bay, which serves as a breeding ground for many aquatic species, including
horseshoe crabs Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not true crabs or even crustaceans; they are chelicerates, more closely related to arachnids like spiders, ticks, and scorpi ...
. The bay is also a prime
oyster Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species, the valves are highly calcified, and many are somewhat irregular in shape. Many, but no ...
ing ground. Delaware Bay was designated a Ramsar Wetland of International Importance on May 20, 1992. It was the first site classified in the
Western Hemisphere Shorebird Reserve Network The Western Hemisphere Shorebird Reserve Network (WHSRN) is a conservation movement, conservation strategy targeting shorebirds in the Americas launched in 1985. Its aim is to protect the nesting, reproduction, breeding and Staging area (birds), st ...
.


Hydrology

Delaware Bay is the
ria A ria (; , feminine noun derived from ''río'', river) is a coastal inlet formed by the partial submergence of an unglaciated river valley. It is a drowned river valley that remains open to the sea. Definitions Typically rias have a dendriti ...
of the Delaware River, i.e. the drowned river valley that had been the river’s alluvial plain in periods of lower sea level during the
Quaternary glaciation The Quaternary glaciation, also known as the Pleistocene glaciation, is an alternating series of glacial period, glacial and interglacial, interglacial periods during the Quaternary period that began 2.58 Year#SI prefix multipliers, Ma (million ...
. While the Delaware River is by far the largest tributary of Delaware Bay, numerous smaller rivers and streams also drain to the bay. These include the
Appoquinimink River The Appoquinimink River is a river flowing to Delaware Bay in northern Delaware in the United States. The river is long and drains an area of on the Atlantic Coastal Plain. The Appoquinimink flows for its entire length in southern New Castl ...
,
Leipsic River The Leipsic River is a riverU.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 1, 2011 in central Delaware in the United States. It rises in northern Kent County, approximately n ...
,
Smyrna River The Smyrna River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 1, 2011 river in central Delaware in the United States. It rises east of Smyrna, Delaware, at the confluence ...
, St. Jones River,
Mispillion River The Mispillion River is a river flowing to Delaware Bay in southern Delaware in the United States. It is approximately long and drains an area of on the Atlantic Coastal Plain. It rises in northern Sussex County, approximately southwest of ...
,
Broadkill River The Broadkill River is a river flowing to Delaware Bay in southern Delaware in the United States. It is long and drains an area of on the Atlantic Coastal Plain. The Broadkill flows for its entire length in eastern Sussex County. It issues fr ...
and
Murderkill River The Murderkill River is a river flowing to Delaware Bay in central Delaware in the United States. It is approximately long and drains an area of on the Atlantic Coastal Plain. The Murderkill flows for its entire length in southern Kent Cou ...
s on the Delaware side, and the
Salem River The Salem River is a tributary of the Delaware River in southwestern New Jersey in the United States. The course and watershed of the Salem River are entirely within Salem County. Tributaries of the Salem include Game Creek, Mannington Cr ...
,
Cohansey River The Cohansey River, also called Cohansey Creek, is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 1, 2011 river in southern New Jersey of the United States. It drains approxima ...
, and
Maurice River The Maurice River (Berkery, Sheri"Do you know how to pronounce these S.J. town names?" ''Courier-Post'', September 5, 2019. Accessed January 26, 2022, via Newspapers.com. "Maurice River/Maurice River Township: MAW-ris, instead of More-eece. So ba ...
s on the New Jersey side.


Ecology

Delaware Bay ecosystem is a key stopover site for over 30 species of migrating shorebirds that migrate north come May. Many birds like red knots use this Bay area to fuel up their energy reserves on
horseshoe crab Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not true crabs or even crustaceans; they are chelicerates, more closely related to arachnids like spiders, ticks, and scor ...
eggs after the long journey. Delaware Bay hosts the largest population of horseshoe crabs in the world.


History

At the time of the arrival of the
Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
ans in the early 17th century, the area around the bay was inhabited by the Native American
Lenape The Lenape (, , ; ), also called the Lenni Lenape and Delaware people, are an Indigenous peoples of the Northeastern Woodlands, Indigenous people of the Northeastern Woodlands, who live in the United States and Canada. The Lenape's historica ...
people. They called the Delaware River "Lenape Wihittuck", which means "the rapid stream of the Lenape". Delaware Bay was called "Poutaxat", which means "near the falls". Delaware Place Names
United States Geological Survey The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on Mar ...
In 1523,
Lucas Vázquez de Ayllón Lucas Vázquez de Ayllón ( – 18 October 1526) was a Spanish magistrate and explorer who in 1526 established the short-lived San Miguel de Gualdape colony, one of the first European attempts at a settlement in what is now the United States. Ayl ...
had received from
Charles V, Holy Roman Emperor Charles V (24 February 1500 – 21 September 1558) was Holy Roman Emperor and Archduke of Austria from 1519 to 1556, King of Spain (as Charles I) from 1516 to 1556, and Lord of the Netherlands as titular Duke of Burgundy (as Charles II) ...
a grant for the land explored in 1521 by Francisco Gordillo and slave trader Captain Pedro de Quejo (de Quexo). Ayllón sent Quejo northward in 1525 and received reports of the coastline from as far north as Delaware Bay. That same year, De Ayllon and Captain Quejo called Delaware Bay by the name "Saint Christopher's Bay". In the 1600s, the bay was known as "Niew Port May" after Captain Cornelius May. Another recorded European visit to the bay was by
Henry Hudson Henry Hudson ( 1565 – disappeared 23 June 1611) was an English sea explorer and navigator during the early 17th century, best known for his explorations of present-day Canada and parts of the Northeastern United States. In 1607 and 16 ...
, who claimed it for the
Dutch East India Company The United East India Company ( ; VOC ), commonly known as the Dutch East India Company, was a chartered company, chartered trading company and one of the first joint-stock companies in the world. Established on 20 March 1602 by the States Ge ...
in 1609. The Dutch called the estuary "Godyns Bay", or "Godins Bay" after a director of the company, Samuel Godijn. As part of the
New Netherland New Netherland () was a colony of the Dutch Republic located on the East Coast of what is now the United States. The claimed territories extended from the Delmarva Peninsula to Cape Cod. Settlements were established in what became the states ...
colony, the Dutch established several settlements (the most famous being
Zwaanendael or was a short-lived Dutch colonial settlement in Delaware. It was built in 1631. The name is archaic Dutch for "swan valley." The site of the settlement later became the town of Lewes, Delaware. History Two directors of the Amsterdam ...
) on the shores of the bay and explored its coast extensively. The thin nature of the corporate colony's presence in the bay and along what was called the South River (now the Delaware) made it possible for
Peter Minuit Peter Minuit (French language, French: ''Pierre Minuit'', Dutch language, Dutch: ''Peter Minnewit''; 1580 – August 5, 1638) was a Walloons, Walloon merchant and politician who was the 3rd Director of New Netherland, Director of the Dutch Nort ...
, the former director of New Netherland, to establish a competing Swedish sponsored settlement,
New Sweden New Sweden () was a colony of the Swedish Empire between 1638 and 1655 along the lower reaches of the Delaware River in what is now Delaware, Maryland, New Jersey, and Pennsylvania. Established during the Thirty Years' War when Sweden was a g ...
in 1638. The resulting dispute with the Dutch colonial authorities in
New Amsterdam New Amsterdam (, ) was a 17th-century Dutch Empire, Dutch settlement established at the southern tip of Manhattan Island that served as the seat of the colonial government in New Netherland. The initial trading ''Factory (trading post), fac ...
(New York City) was settled when
Petrus Stuyvesant Peter Stuyvesant ( – August 1672)Mooney, James E. "Stuyvesant, Peter" in p.1256 was a Dutch colonial administrator who served as the director-general of New Netherland from 1647 to 1664, when the colony was provisionally ceded to the King ...
led a Dutch military force into the area in 1655. After the English took title to the New Netherland colony in 1667 at the Treaty of Breda the bay came into their possession and was renamed Delaware Bay, the name given it in 1610 by
Samuel Argall Sir Samuel Argall ( or 1580 – ) was an English sea captain, navigator, and Deputy-Governour of Virginia, an English colony. As a sea captain, in 1609, Argall was the first to determine a shorter northern route from England across the Atlan ...
, after the then new Governor of Virginia,
Thomas West, 3rd Baron De La Warr Thomas West, 3rd Baron De La Warr ( ; 9 July 1576 – 7 June 1618), was an English nobleman, for whom the bay, the river, and, consequently, a Native American people and U.S. state, all later called "Delaware", were named. A member of the Ho ...
. The
Native American tribe In the United States, an American Indian tribe, Native American tribe, Alaska Native village, Indigenous tribe, or Tribal nation may be any current or historical Tribe (Native American)#Other uses, tribe, band, or nation of Native Americans in ...
living along the bay and river were later called the Delaware by the Europeans due to their location. The U.S. state also takes its name from the bay and the river. Conflicting crown grants were made to the
James, Duke of York James II and VII (14 October 1633 – 16 September 1701) was King of England and Monarchy of Ireland, Ireland as James II and King of Scotland as James VII from the death of his elder brother, Charles II of England, Charles II, on 6 February 1 ...
and
William Penn William Penn ( – ) was an English writer, religious thinker, and influential Quakers, Quaker who founded the Province of Pennsylvania during the British colonization of the Americas, British colonial era. An advocate of democracy and religi ...
on the west bank of the bay and river. Settlement grew rapidly, leading
Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
, upriver on the Delaware, to become the largest city in
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
in the 18th century. Penn viewed access to Delaware Bay as being so critical to Pennsylvania's survival that he engaged in an eighty-year long legal boundary dispute with the Calvert family to secure it. During the
French and Indian War The French and Indian War, 1754 to 1763, was a colonial conflict in North America between Kingdom of Great Britain, Great Britain and Kingdom of France, France, along with their respective Native Americans in the United States, Native American ...
the dissemination of Joshua Fisher's original publication of the "Chart of Delaware Bay" was restricted by the authorities as its accuracy might advantage an enemy approach. In 1782 during the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
,
Continental Navy The Continental Navy was the navy of the United Colonies and United States from 1775 to 1785. It was founded on October 13, 1775 by the Continental Congress to fight against British forces and their allies as part of the American Revolutionary ...
Lieutenant A lieutenant ( , ; abbreviated Lt., Lt, LT, Lieut and similar) is a Junior officer, junior commissioned officer rank in the armed forces of many nations, as well as fire services, emergency medical services, Security agency, security services ...
Joshua Barney Joshua Barney (6 July 1759 – 1 December 1818) was an American naval officer who served in the Continental Navy during the American Revolutionary War and in the French Navy during the French Revolutionary Wars. He later achieved the rank of comm ...
fought with a British squadron within the bay. Barney's force of three sloops defeated a
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
frigate A frigate () is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied. The name frigate in the 17th to early 18th centuries was given to any full-rigged ship built for speed and maneuvera ...
, a sloop-of-war and a
Loyalist Loyalism, in the United Kingdom, its overseas territories and its former colonies, refers to the allegiance to the British crown or the United Kingdom. In North America, the most common usage of the term refers to loyalty to the British Cr ...
privateer A privateer is a private person or vessel which engages in commerce raiding under a commission of war. Since robbery under arms was a common aspect of seaborne trade, until the early 19th century all merchant ships carried arms. A sovereign o ...
. The strategic importance of the bay was noticed by the
Marquis de Lafayette Marie-Joseph Paul Yves Roch Gilbert du Motier de La Fayette, Marquis de La Fayette (; 6 September 1757 – 20 May 1834), known in the United States as Lafayette (), was a French military officer and politician who volunteered to join the Conti ...
during the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
, who proposed the use of
Pea Patch Island Fort Delaware State Park is a , Delaware state park on Pea Patch Island in the mid channel of the Delaware River near its entrance into Delaware Bay. It is a low, marshy island in New Castle County, Delaware, facing Delaware City on the Dela ...
at the head of the bay for a defensive fortification to protect the important ports Philadelphia and
New Castle, Delaware New Castle is a city in New Castle County, Delaware, United States. The city is located six miles (10 km) south of Wilmington, Delaware, Wilmington and is situated on the Delaware River. As of 2020, the city's population was 5,551. New Cast ...
.
Fort Delaware Fort Delaware is a former harbor defense facility, designed by chief engineer Joseph Gilbert Totten and located on Pea Patch Island in the Delaware River.Dobbs, Kelli W., et al. During the American Civil War (1861-1865), the Union / Unite ...
was later constructed on Pea Patch Island. During the
American Civil War The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of A ...
it was used as a Union prison camp. In 1855, the United States government systematically undertook the formation of a channel wide from
Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
to deep water in Delaware Bay. The
Rivers and Harbors Act of 1899 The Rivers and Harbors Appropriation Act of 1899 is the oldest federal environmental law in the United States. The Act makes it a misdemeanor to discharge refuse matter of any kind into the navigable waters, or tributaries thereof, of the Unite ...
provided for a channel wide from Philadelphia to the deep water of the bay. Other names for the bay have been "South Bay" and "Zuyt Baye".


Today

The bay is one of the most important navigational channels in the United States; it is the second busiest waterway after the
Mississippi River The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
. Its lower course forms part of the
Intracoastal Waterway The Intracoastal Waterway (ICW) is a Navigability, inland waterway along the Atlantic and Gulf of Mexico coasts of the United States, running from Massachusetts southward along the Atlantic Seaboard and around the southern tip of Florida, the ...
. The need for direct navigation around the two capes into the ocean is circumvented by the Cape May Canal and the
Lewes and Rehoboth Canal The Lewes and Rehoboth Canal is a canal in Sussex County, Delaware, which connects the Broadkill River and the Delaware Bay to Rehoboth Bay. It forms a portion of the Intracoastal Waterway. History Originally proposed in 1803, the canal was ...
at the north and south capes respectively. The upper bay is connected directly to the north end of
Chesapeake Bay The Chesapeake Bay ( ) is the largest estuary in the United States. The bay is located in the Mid-Atlantic (United States), Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula, including parts of the Ea ...
by the
Chesapeake and Delaware Canal The Chesapeake & Delaware Canal (C&D Canal) is a -long, -wide and -deep ship canal that connects the Delaware River with the Chesapeake Bay in the states of Delaware and Maryland in the United States. In the mid-17th century, mapmaker Augus ...
. The U.S Coast Guard sector for Delaware Bay was established in 2005, and has 570 active personnel, and 195 reservists.


See also

* Partnership for the Delaware Estuary *
Lewes and Rehoboth Canal The Lewes and Rehoboth Canal is a canal in Sussex County, Delaware, which connects the Broadkill River and the Delaware Bay to Rehoboth Bay. It forms a portion of the Intracoastal Waterway. History Originally proposed in 1803, the canal was ...
*
Chesapeake and Delaware Canal The Chesapeake & Delaware Canal (C&D Canal) is a -long, -wide and -deep ship canal that connects the Delaware River with the Chesapeake Bay in the states of Delaware and Maryland in the United States. In the mid-17th century, mapmaker Augus ...
*
Broadkill River The Broadkill River is a river flowing to Delaware Bay in southern Delaware in the United States. It is long and drains an area of on the Atlantic Coastal Plain. The Broadkill flows for its entire length in eastern Sussex County. It issues fr ...
* St. Jones River


References


Further reading

* Myers, Albert Cook, ed. ''Narratives of Early Pennsylvania, West New Jersey, and Delaware, 1630 -1707''. (New York, NY: Charles Scribner's Sons. 1912) *Ward, Christopher. ''Dutch and Swedes on the Delaware, 1609 – 1664'' (University of Pennsylvania Press. 1930) *Leiby, A. C. ''The Early Dutch and Swedish Settlers of New Jersey'' (Princeton: D. Van Nostrand Co. 1964)


External links


Delaware Riverkeeper NetworkDiscover Delaware Bay New Jersey
* * {{Authority control Bays of Delaware Bays of New Jersey
Bay A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a ''gulf'', ''sea'', ''sound'', or ''bight''. A ''cove'' is a small, ci ...
Estuaries of Delaware Estuaries of New Jersey Intracoastal Waterway Bodies of water of Cape May County, New Jersey Bodies of water of Cumberland County, New Jersey Bodies of water in New Castle County, Delaware Bodies of water in Kent County, Delaware Bodies of water of Salem County, New Jersey Bodies of water in Sussex County, Delaware Borders of Delaware Borders of New Jersey Ramsar sites in the United States Bays of Sussex County, Delaware