81-641: The Mississippi River is the primary river of the largest drainage basin in the United States . From its traditional source of Lake Itasca in northern Minnesota , it flows generally south for 2,340 miles (3,766 km) to the Mississippi River Delta in the Gulf of Mexico . With its many tributaries , the Mississippi's watershed drains all or parts of 32 U.S. states and two Canadian provinces between
162-626: A Strahler number of 10, the highest in the nation. Eight rivers, including the Columbia River , reach 9. Streams with no tributaries, assigned the Strahler number 1, are most common. More than 1.5 million of these small streams, with average drainage basins of only 1 square mile (2.6 km ), have been identified in the United States alone. Outside of the United States, the Amazon River reaches
243-650: A Strahler number of 12, making it the highest-order river in the world. Treaty of Paris (1783) The Treaty of Paris , signed in Paris by representatives of King George III of Great Britain and representatives of the United States on September 3, 1783, officially ended the American Revolutionary War and recognized the Thirteen Colonies , which had been part of colonial British America , to be free, sovereign and independent states. The treaty set
324-739: A clear northern boundary, which resulted in a territorial dispute resolved by the Treaty of Madrid in 1795. Spain also received the island of Menorca , but the Bahamas , Grenada , and Montserrat , which had been captured by the French and Spaniards, were returned to Britain. The treaty with France was mostly about exchanges of captured territory. France's only net gains were the island of Tobago , and Senegal in Africa, but it also reinforced earlier treaties, guaranteeing fishing rights off Newfoundland . Dutch possessions in
405-701: A length of 3,710 miles (5,971 km), making it the fourth longest river in the world after the Nile , Amazon , and Yangtze . When measured by the largest stream source (by water volume), the Ohio River , by extension the Allegheny River , would be the source, and the Mississippi would begin in Pennsylvania . At its source at Lake Itasca , the Mississippi River is about 3 feet (0.91 m) deep. The average depth of
486-404: A reference to the divine providence , states the bona fides of the signatories, and declares the intention of both parties to "forget all past misunderstandings and differences" and "secure to both perpetual peace and harmony." Eschatocol . "Done at Paris, this third day of September in the year of our Lord, one thousand seven hundred and eighty-three." Historians have often commented that
567-452: A return for their property in the US legal system after the American Revolutionary War , but most were unsuccessful. The actual geography of North America turned out not to match the details used in the treaty. The treaty specified a southern boundary for the United States, but the separate Anglo-Spanish agreement did not specify a northern boundary for Florida. The Spanish government assumed that
648-588: A second-order stream; when two second-order streams meet, they form a third-order stream, and so on. In the Horton system, the entire mainstem of a drainage basin was assigned the highest number in that basin. However, in the Strahler system, adopted in 1957, only that part of the mainstem below the tributary of the next highest rank gets the highest number. In the United States, the Mississippi River mainstem achieves
729-579: A solution to deadlocked negotiations between the United States and the British, which was rejected by the United States. France was exhausted by the war, and all parties sought peace, except for Spain, which insisted on continuing the Revolutionary War until it could capture Gibraltar from the British . Vergennes developed treaty terms under which Spain would forego holding Gibraltar and the United States would be granted independence, but it would be confined to
810-748: Is 208,200 cu ft/s (5,900 m/s). 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 further upstream), rather than the Middle Mississippi. In addition to the Ohio River , the major tributaries of the Lower Mississippi River are the White River , flowing in at the White River National Wildlife Refuge in east-central Arkansas;
891-556: Is a meandering river in a broad, flat area, only rarely flowing alongside a bluff (as at Vicksburg, Mississippi ). The Mississippi River is known as the Middle Mississippi from the Upper Mississippi River's confluence with the Missouri River at St. Louis, Missouri , for 190 miles (310 km) to its confluence with the Ohio River at Cairo, Illinois . The Middle Mississippi is relatively free-flowing. From St. Louis to
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#1732837032197972-540: 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 1,000 miles (1,600 km). At the confluence of the Ohio and the Middle Mississippi, the long-term mean discharge of the Ohio at Cairo, Illinois is 281,500 cubic feet per second (7,970 cubic meters per second), while the long-term mean discharge of the Mississippi at Thebes, Illinois (just upriver from Cairo)
1053-867: 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 at Fort Snelling in the Twin Cities ; the St. Croix River near Prescott, Wisconsin ; the Cannon River near Red Wing, Minnesota ; the Zumbro River at Wabasha, Minnesota ; the Black , La Crosse , and Root rivers in La Crosse, Wisconsin ; the Wisconsin River at Prairie du Chien, Wisconsin ;
1134-509: Is largely a multi-thread stream with many bars and islands. From its confluence with the St. Croix River downstream to Dubuque, Iowa , 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 . This topography contrasts strongly with the Lower Mississippi, which
1215-528: Is the only true waterfall on the entire Mississippi River. The water elevation continues to drop steeply as it passes through the gorge 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 . However, the Locks were closed in 2015 to control the spread of invasive Asian carp , making Minneapolis once again
1296-604: The American Civil War , the Mississippi's capture by Union forces marked a turning point towards victory , due to the river's strategic importance to the Confederate war effort. Because of the substantial growth of cities and the larger ships and barges that replaced steamboats, the first decades of the 20th century saw the construction of massive engineering works such as levees , locks and dams , often built in combination. A major focus of this work has been to prevent
1377-696: The American Revolutionary War . The negotiations continued through the summer of 1782. Representing the United States were Benjamin Franklin , John Jay , Henry Laurens , and John Adams . Representing the Kingdom of Great Britain and King George III were David Hartley and Richard Oswald . The treaty was drafted on November 30, 1782, and signed at the Hôtel d'York at present-day 56 Rue Jacob in Paris on September 3, 1783, by Adams, Franklin, Jay, and Hartley. In September 1782, French Foreign Minister Vergennes proposed
1458-831: The Arkansas River , joining the Mississippi at Arkansas Post ; the Big Black River in Mississippi; and the Yazoo River , meeting the Mississippi at Vicksburg, Mississippi . Deliberate water diversion at the Old River Control Structure in Louisiana allows the Atchafalaya River in Louisiana to be a major distributary of the Mississippi River, with 30% of the combined flow of the Mississippi and Red Rivers flowing to
1539-638: The Dutch Republic , are known collectively as the Peace of Paris . Only Article 1 of the treaty, which acknowledges the United States' existence as free sovereign and independent states , remains in force. The U.S. borders changed in later years, which is a major reason specific articles of the treaty were superseded. Preamble . Declares the treaty to be "in the Name of the Most Holy and Undivided Trinity" followed by
1620-795: The East Indies , captured in 1781, were returned by Britain to the Netherlands in exchange for trading privileges in the Dutch East Indies by a treaty, which was not finalized until 1784. The Congress of the Confederation , operating as the legislative body of the newly established United States, ratified the Treaty of Paris on January 14, 1784 , in Annapolis, Maryland , in the Old Senate Chamber of
1701-538: The 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 , Mount Elbert at 14,440 feet (4,400 m). In the United States, the Mississippi River drains the majority of the area between the crest of the Rocky Mountains and
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#17328370321971782-596: The Lake of the Woods in present-day Minnesota , Manitoba , and Ontario , directly westward until it reached the Mississippi River . However, the Mississippi does not extend that far northward, and the line going west from the Lake of the Woods never intersects the river. Additionally, the Treaty of Paris did not explain how the new border would function in terms of controlling the movement of people and trade between British North America and
1863-629: The Maryland State House . Copies were sent back to Europe for ratification by the other parties involved, the first reaching France in March 1784. British ratification occurred on April 9, 1784, and the ratified versions were exchanged in Paris on May 12, 1784. The treaty and the separate peace treaties between Great Britain and the three colonial powers that supported the American cause, France , Spain , and
1944-582: The Minnesota River , James River , and Milk River valleys. When the ice sheet completely retreated, many of these "temporary" rivers found paths to Hudson Bay 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 , about 300,000 to 132,000 years before present, blocked
2025-556: The Ohio and Missouri , formed pathways for the western expansion of the United States. The river also became the subject of American literature , particularly in the writings of Mark Twain . Formed from thick layers of the river's silt deposits, the Mississippi embayment is one of the most fertile regions of the United States; steamboats were widely used in the 19th and early 20th centuries to ship agricultural and industrial goods. During
2106-1226: The Rock River at the Quad Cities ; the Iowa River near Wapello, Iowa ; the Skunk River south of Burlington, Iowa ; and the Des Moines River at Keokuk, Iowa . Other major tributaries of the Upper Mississippi include the Crow River in Minnesota, the Chippewa River in Wisconsin, the Maquoketa River and the Wapsipinicon River in Iowa, and the Illinois River in Illinois. The Upper Mississippi
2187-527: The Rocky and Appalachian mountains. The river either borders or passes through the states of Minnesota , Wisconsin , Iowa , Illinois , Missouri , Kentucky , Tennessee , Arkansas , Mississippi , and Louisiana . The main stem is entirely within the United States; the total drainage basin is 1,151,000 sq mi (2,980,000 km), of which only about one percent is in Canada. The Mississippi ranks as
2268-427: The boundaries between British North America , later called Canada , and the United States, on lines the British labeled as "exceedingly generous", although exact boundary definitions in the far-northwest and to the south continued to be subject to some controversy. Details included fishing rights and restoration of property and prisoners of war . This treaty and the separate peace treaties between Great Britain and
2349-429: The headwaters 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 , and continuing throughout
2430-422: The 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
2511-509: The Americans had received from Britain automatically when they had colonial status, including protection from pirates in the Mediterranean Sea were lost. Individual states ignored federal recommendations, under Article 5, to restore confiscated Loyalist property and Article 6, which provided for confiscating Loyalist property for "unpaid debts". The Commonwealth of Virginia defied Article 4 and maintained laws against payment of debts to British creditors. Several Loyalists attempted to file for
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2592-462: The British Empire, the Jay Treaty . Great Britain violated the treaty stipulation that it would relinquish control of forts in United States territory "with all convenient speed". British troops remained stationed at six forts in the Great Lakes region and at two at the north end of Lake Champlain . The British also built an additional fort in present-day Ohio in 1794, during the Northwest Indian War . They justified their treaty violations during
2673-399: The French rendering of the Anishinaabe ( Ojibwe or Algonquin ) name for the river, Misi-ziibi (Great River). In the 18th century, the river was set by the Treaty of Paris as, for the most part, the western border of the new United States. With the Louisiana Purchase and the country's westward expansion, it became a convenient boundary line between the western and eastern halves of
2754-523: The Gulf of Mexico about 100 miles (160 km) 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 's number is 2,340 miles (3,766 km). The retention time from Lake Itasca to the Gulf is typically about 90 days; while speed varies along the course of the river, this gives an overall average of around 26 mi (42 km) per day, or 1 mi (1.6 km) per hour. The stream gradient of
2835-537: The Gulf of Mexico across the delta region. As Pangaea began to break up about 95 million years ago, North America passed over a volcanic " hotspot " in the Earth's mantle (specifically, the Bermuda hotspot ) that was undergoing a period of intense activity. The upwelling of magma from the hotspot forced the further uplift to a height of perhaps 2–3 km of part of the Appalachian-Ouachita range, forming an arch that blocked southbound water flows. The uplifted land quickly eroded and, as North America moved away from
2916-582: The Gulf of Mexico by this route, rather than continuing down the Mississippi's current channel past Baton Rouge and New Orleans on a longer route to the Gulf. Although the Red River was once an additional tributary, its water now flows separately into the Gulf of Mexico through the Atchafalaya River. The Mississippi River has the world's fourth-largest drainage basin ("watershed" or "catchment"). The basin covers more than 1,245,000 square miles (3,220,000 km), including all or parts of 32 U.S. states and two Canadian provinces. The drainage basin empties into
2997-401: The Illinoian Stage. Timeline of outflow 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 and separated from the rest of Tennessee by the new river channel. Since this event was an avulsion , rather than the effect of incremental erosion and deposition,
3078-408: The Midwestern and eastern U.S. These earthquakes created Reelfoot Lake in Tennessee from the altered landscape near the river. When measured from its traditional source at Lake Itasca , the Mississippi has a length of 2,340 miles (3,766 km). When measured from its longest stream source (most distant source from the sea), Brower's Spring in Montana , the source of the Missouri River , it has
3159-525: The Mississippi River at its center. 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 bayous . This process has, over
3240-416: The Mississippi River between Saint Paul and Saint Louis is between 9 and 12 feet (2.7–3.7 m) deep, the deepest part being Lake Pepin , which averages 20–32 feet (6–10 m) deep and has a maximum depth of 60 feet (18 m). Between where the Missouri River joins the Mississippi at Saint Louis, Missouri, and Cairo, Illinois, the depth averages 30 feet (9 m). Below Cairo, where the Ohio River joins,
3321-415: 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. Four great earthquakes in 1811 and 1812 , estimated at 8 on the Richter magnitude scale , had tremendous local effects in the then sparsely settled area, and were felt in many other places in
Mississippi River - Misplaced Pages Continue
3402-401: The Mississippi River transported an estimated 440 million short tons (400 million metric tons) of 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 160 million short tons (145 million metric tons) per year. The reduction in sediment transported down the Mississippi River is
3483-399: The Mississippi River. Main stem In hydrology , a main stem or mainstem (also known as a trunk ) is "the primary downstream segment of a river , as contrasted to its tributaries ". The mainstem extends all the way from one specific headwater to the outlet of the river, although there are multiple ways to determine which headwater (or first-order tributary) is the source of
3564-404: 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 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 follows the ancient channel used by the Mississippi River before
3645-529: 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. 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 source of the Upper Mississippi branch is traditionally accepted as Lake Itasca , 1,475 feet (450 m) above sea level in Itasca State Park in Clearwater County, Minnesota . The name Itasca
3726-443: The Ohio River confluence, the Middle Mississippi falls 220 feet (67 m) over 180 miles (290 km) for an average rate of 1.2 feet per mile (23 cm/km). At its confluence with the Ohio River, the Middle Mississippi is 315 feet (96 m) above sea level. Apart from the Missouri and Meramec rivers of Missouri and the Kaskaskia River of Illinois, no major tributaries enter the Middle Mississippi River. The Mississippi River
3807-406: The United States and deliberately so from the British point of view. Shelburne foresaw highly profitable two-way trade between Britain and the rapidly-growing United States, which came to pass. Great Britain also signed separate agreements with France and Spain, and provisionally with the Netherlands. In the treaty with Spain, the territories of East and West Florida were ceded to Spain without
3888-403: The United States would gain all of the area east of the Mississippi River , north of present-day Florida , and south of present-day Canada . The northern boundary would be almost the same as it is today. The United States would gain fishing rights off Nova Scotia 's coasts and agreed to allow British merchants and Loyalists to try to recover their property. The treaty was highly favorable for
3969-498: The United States. The American diplomats' expectation of negotiating a commercial treaty with Great Britain to resolve some of the unfinished business of the Treaty of Paris failed to materialize in 1784. Despite government agreements for British evacuation of northern forts, Britain continued to occupy the forts. Meanwhile, the British were dissatisfied with the American harassment of Loyalists . The United States would thus wait until 1794 to negotiate its first commercial agreement with
4050-430: The Upper Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is 799 feet (244 m). Below the dam, the river's elevation is 750 feet (230 m). This 49-foot (15 m) 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
4131-424: 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 . 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
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#17328370321974212-414: The area east of the Appalachian Mountains . Britain would keep the area north of the Ohio River , which was part of the Province of Quebec . In the area south of that would be an independent Indian barrier state , under Spanish control. The American delegation perceived that they could obtain a better treaty in negotiating directly with the British in London . John Jay promptly told the British that he
4293-403: The boundary was the same as in the 1763 agreement by which it had first given its territory in Florida to Great Britain. While the West Florida Controversy continued, Spain used its new control of Florida to block American access to the Mississippi, in defiance of Article 8. To the north, the treaty stated that the boundary of the United States extended from the " most northwesternmost point " of
4374-405: The country. This is reflected in the Gateway Arch in St. Louis, which was designed to symbolize the opening of the West, and the focus on the " Trans-Mississippi " region in the Trans-Mississippi Exposition . Regional landmarks are often classified in relation to the river, such as "the highest peak east of the Mississippi " or "the oldest city west of the Mississippi". The FCC also uses it as
4455-424: The crest of the Appalachian Mountains , except for various regions drained to Hudson Bay by the Red River of the North ; to the Atlantic Ocean by the Great Lakes and the Saint Lawrence River ; and to the Gulf of Mexico by the Rio Grande , the Alabama and Tombigbee rivers, the Chattahoochee and Appalachicola rivers, and various smaller coastal waterways along the Gulf. The Mississippi River empties into
4536-402: The delta of the Chippewa River of Wisconsin as it enters the Upper Mississippi, is more than 2 miles (3.2 km) wide. By the time the Upper Mississippi reaches Saint Paul , Minnesota, below Lock and Dam No. 1, it has dropped more than half its original elevation and is 687 feet (209 m) above sea level. From St. Paul to St. Louis, Missouri, the river elevation falls much more slowly and
4617-530: The depth averages 50–100 feet (15–30 m) deep. The deepest part of the river is in New Orleans, where it reaches 200 feet (61 m) deep. The Mississippi River runs through or along 10 states, from Minnesota to Louisiana , and is used to define portions of these states' borders, with Wisconsin , Illinois , Kentucky , Tennessee , and Mississippi along the east side of the river, and Iowa , Missouri , and Arkansas along its west side. Substantial parts of both Minnesota and Louisiana are on either side of
4698-404: The dividing line for broadcast call-signs , which begin with W to the east and K to the west, overlapping in media markets along the river. Due to its size and importance, it has been nicknamed The Mighty Mississippi River or simply The Mighty Mississippi . The Mississippi River can be divided into three sections: the Upper Mississippi , the river from its headwaters to the confluence with
4779-460: The entire river is 0.01%, a drop of 450 m over 3,766 km. The Mississippi River discharges at an annual average rate of between 200 and 700 thousand cubic feet per second (6,000 and 20,000 m/s). The Mississippi is the fourteenth largest river in the world by volume. On average, the Mississippi has 8% the flow of the Amazon River , which moves nearly 7 million cubic feet per second (200,000 m/s) during wet seasons. Before 1900,
4860-412: The hot spot and as the hotspot's activity declined, the crust beneath the embayment region cooled, contracted and subsided to a depth of 2.6 km, and around 80 million years ago the Reelfoot Rift formed a trough that was flooded by the Gulf of Mexico . As sea levels dropped, the Mississippi and other rivers extended their courses into the embayment , which gradually became filled with sediment with
4941-436: The lower 10 miles (16 km) 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 2,300 acres (930 ha) island and community of 14 residents is known as an enclave of Illinois and is accessible only from the Missouri side. The New Madrid Seismic Zone , along
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#17328370321975022-415: The lower Mississippi from shifting into the channel of the Atchafalaya River and bypassing 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 . The word Mississippi itself comes from Misi zipi ,
5103-538: The mainstem. Water enters the mainstem from the river's drainage basin , the land area through which the mainstem and its tributaries flow. A drainage basin may also be referred to as a watershed or catchment . Hydrological classification systems assign numbers to tributaries and mainstems within a drainage basin. In the Strahler number , a modification of a system devised by Robert E. Horton in 1945, channels with no tributaries are called "first-order" streams. When two first-order streams meet, they are said to form
5184-423: The nations that supported the American cause, including France , Spain , and the Dutch Republic are known collectively as the Peace of Paris . Only Article 1 of the treaty, which acknowledges the United States' existence as free, sovereign , and independent states , remains in force. Peace negotiations began in Paris in April 1782, following the victory of George Washington and the Continental Army in
5265-439: The native way of life as first explorers, then settlers, ventured into the basin in increasing numbers. The river served sometimes as a barrier, forming borders for New Spain , New France , and the early United States, and throughout as a vital transportation artery and communications link. In the 19th century, during the height of the ideology of manifest destiny , the Mississippi and several tributaries, most notably its largest,
5346-449: The new river channel, contiguous with the adjacent state. Also, due to a meander in the river, a small part of western Kentucky is contiguous with Tennessee but isolated from the rest of its state. 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. The road crossing highest on
5427-425: The past 5,000 years, caused the coastline of south Louisiana to advance toward the Gulf from 15 to 50 miles (24 to 80 km). The currently active delta lobe 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. The current form of the Mississippi River basin was largely shaped by the Laurentide Ice Sheet of
5508-587: The result of engineering modification of the Mississippi, Missouri, and Ohio rivers and their tributaries by dams, meander cutoffs , river-training structures, and bank revetments and soil erosion control programs in the areas drained by them. Denser salt water from the Gulf of Mexico forms a salt wedge along the river bottom near the mouth of the river, while fresh water flows near the surface. In drought years, with less fresh water to push it out, salt water can travel many miles upstream—64 miles (103 km) in 2022—contaminating drinking water supplies and requiring
5589-477: 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
5670-432: The salt water immediately. The images from NASA 's MODIS 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 , and entered the Gulf Stream . The Mississippi River water rounded
5751-399: 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 , near Grand Rapids, Minnesota , over 11 miles (18 km) across. Lake Onalaska , created by Lock and Dam No. 7 , near La Crosse, Wisconsin , is more than 4 miles (6.4 km) wide. Lake Pepin , a natural lake formed behind
5832-523: 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 (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
5913-462: The tip of Florida and traveled up the southeast coast to the latitude of Georgia before finally mixing in so thoroughly with the ocean that it could no longer be detected by MODIS. 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
5994-516: The treaty was very generous to the United States in terms of greatly enlarged boundaries. Historians such as Alvord, Harlow, and Ritcheson have emphasized that British generosity was based on a statesmanlike vision of close economic ties between Britain and the United States. The concession of the vast trans-Appalachian region was designed to facilitate the growth of the American population and to create lucrative markets for British merchants without any military or administrative costs to Britain. The point
6075-403: The unstable and extremely tense time that existed in the area following the Revolutionary War, and in the failure of the newly established federal government of the United States to fulfill commitments made to compensate loyalists for British losses, forcing the British to liquidate various assets in the region. All of the posts were relinquished peacefully through diplomatic means as a result of
6156-566: 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 on the Mississippi is the St. Anthony Falls Lock. Before the Coon Rapids Dam in Coon Rapids, Minnesota , was built in 1913, steamboats could occasionally go upstream as far as Saint Cloud, Minnesota , depending on river conditions. The uppermost lock and dam on
6237-416: The use of desalination . The United States Army Corps of Engineers constructed "saltwater sills" or "underwater levees" to contain this in 1988, 1999, 2012, and 2022. This consists of a large mound of sand spanning the width of the river 55 feet below the surface, allowing fresh water and large cargo ships to pass over. Fresh river water flowing from the Mississippi into the Gulf of Mexico does not mix into
6318-513: The world's tenth-largest river by discharge flow, and the largest in North America. Native Americans have lived along the Mississippi River and its tributaries for thousands of years. Many were hunter-gatherers , but some, such as the Mound Builders , formed prolific agricultural and urban civilizations, and some practiced aquaculture . The arrival of Europeans in the 16th century changed
6399-495: 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 ( ver itas ) and the first two letters of the Latin word for head ( ca put ). However, the lake is in turn fed by a number of smaller streams. From its origin at Lake Itasca to St. Louis, Missouri , the waterway's flow is moderated by 43 dams. Fourteen of these dams are located above Minneapolis in
6480-410: Was that the United States would become a major trading partner. As French Foreign Minister Vergennes later put it, "The English buy peace rather than make it." Vermont was included within the boundaries because the state of New York insisted that Vermont was a part of New York although Vermont was then under a government that considered Vermont not to be a part of the United States . Privileges that
6561-468: Was willing to negotiate directly with them and to bypass France and Spain, and British Prime Minister Lord Shelburne agreed. In charge of the British negotiations, some of which took place in his study at Lansdowne House , now a bar in the Lansdowne Club , Shelburne now saw a chance to split the United States from France and to establish the new nation as a valuable economic partner. The terms were that
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