Mississippi (river US)

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MISSISSIPPI RIVER. One of the major rivers of North America, the Mississippi River has been a focal point in American history, commerce, agriculture, literature, and environmental awareness. The length of the Mississippi River from its source in Lake Itasca in northwestern Minnesota to its mouth in the Gulf of Mexico flows 2,348 miles; it is the second longest river in the United States behind the Missouri (2,466 miles). The Mississippi River system drains the agricultural plains between the Appalachian Mountains to the east and the Rocky Mountains to the west. This drainage basin (approximately 1,234,700 square miles) covers about 40 percent of the United States and ranks as the fifth largest in the world.

Mississippi River's Course

The Mississippi River actually begins as a small stream flowing from Lake Itasca, Minnesota. The river initially flows north and then east as the means of connecting several lakes in northern Minnesota. The river begins to flow southward near Grand Rapids, Minnesota, and is joined with the Minnesota River between the cities of Minneapolis and Saint Paul. The muddy waters of the Missouri River flow into the clear waters of the Mississippi River just north of St. Louis, Missouri. At this point, the Mississippi

becomes brown and muddy for the rest of the journey south.

At Cairo, Illinois, the Ohio River flows into the Mississippi, doubling its volume and creating the point that divides the Upper Mississippi from the Lower Mississippi. The Lower Mississippi Valley is a wide and fertile region. In this area, the river meanders its way south and over time has continuously changed its course, leaving behind numerous oxbow lakes as remnants of its past. As it flows in this southern region, the Mississippi deposits rich silt along its banks. In many areas, the silt builds up to create natural levees. South of Memphis, Tennessee, the Arkansas River junctions with the Mississippi River. Near Fort Adams, Mississippi, the Red River joins with the Mississippi, diverting with it about a quarter of the flow of the Mississippi into the Atchafalaya River.

As the Mississippi River nears the Gulf of Mexico it creates a large delta with its silt. The Mississippi River delta covers approximately 13,000 square miles. South of the city of New Orleans, the Mississippi creates several channels, known as distributaries, which then flow separately into the Gulf of Mexico. The most prominent of these are known as the North Pass, South Pass, Southwest Pass, and Main Pass. Annually, the Mississippi River discharges about 133 cubic miles of water (approximately 640,000 cubic feet per second).


The Mississippi River played an important role in the lives of many Native Americans who lived in the Upper Mississippi Valley, such as the Santee Dakota, the Illinois, the Kickapoo, and the Ojibwe, as well as those tribes in the southern valley, such as the Chicksaw, the Choctaw, the Tunica, and the Natchez. The name "Mississippi," meaning "great river" or "gathering of water," is attributed to the Ojibwe (Chippewa).

The first known European to travel on the Mississippi River was the Spaniard Hernando de Soto, who crossed the river near present-day Memphis in May 1541. Over a century later, in 1673, the French explorers Louis Jolliet and Father Jacques Marquette entered the Mississippi River from the Wisconsin River and traveled by canoe downriver to a point near the mouth of the Arkansas River. Less than a decade later, another Frenchman, René-Robert Cavelier, Sieur de La Salle, explored the Mississippi River from the Illinois River to the Gulf of Mexico. La Salle declared on 9 April 1682 that the Mississippi Valley belonged to France, and he named the region Louisiana. It was not until 1718 that the French were actually established at New Orleans. They maintained control over the lower Mississippi until the end of the French and Indian War (1754–1763). In 1762 and 1763, the French made cessions that established the Mississippi River as an international boundary with Spanish territory to the west and British territory to the east.

During the American Revolution (1775–1783), the river served as the supply line for George Rogers Clark, allowing him to maintain control of the Illinois country. The Peace of Paris of 1783 outlined the new country of the United States as extending to the Mississippi River between Spanish Florida and the Canadian border. Additionally, the United States was entitled to free navigation of the Mississippi River. Spain, though not party to the treaty, controlled the mouth of the Mississippi and, through high duties, maintained actual power over the river and, in essence, over the entire Mississippi Valley. Not until Pinckney's Treaty with Spain in 1795 was the river truly free to American navigation. This freedom was short-lived, however, for when Spain ceded Louisiana back to France in 1800, the French again closed the Mississippi to American river traffic. Finally, the Louisiana Purchase (1803) made the Mississippi an American river, and it rapidly became a major route of trade and commerce for the entire Mississippi Valley.

Western settlers and traders traversed the Mississippi in flatboats (on which farmers floated their produce downstream to market) and keelboats (which could be pushed upstream with great effort). Certainly the most significant change in river transportation on the Mississippi came in 1811 when the steamboat New Orleans made its legendary trip from Pittsburgh to New Orleans. This event opened the Mississippi River to two-way traffic, essentially doubling the carrying capacity of the river. By 1860, more than 1,000 steamboats were actively engaged in transport along the Mississippi River system, and the cities of Cincinnati (Ohio), Louisville, (Kentucky), St. Louis, Memphis, and New Orleans became important cities in the movement west.

During the Civil War (1861–1865) both the Union and the Confederacy recognized the importance of the Mississippi River, and the fight over its control was a major part of the war. A decisive victory for the Union came with the fall of Vicksburg, Mississippi (1863), which essentially gave the Union full possession of the river, reopening the trade routes down the Mississippi from the Ohio Valley and splitting the Confederacy.

Following the war, life on the Mississippi did not return to the golden years so richly described in Mark Twain's writings. The faster and more convenient railroads replaced much of the commercial traffic on the Mississippi. In 1879, the U.S. Congress established the Mississippi River Commission as a means of maintaining and improving the river as a commercial waterway. In the years that followed, the commission deepened and widened several channels along the river, making it more navigable for larger boats and barges. These changes promoted increased transport on the Mississippi, particularly of heavy and bulky freight.

At the turn of the twenty-first century, the Mississippi River carried more than half of the freight transported on American inland water. Nearly 460 million short tons of freight were transported on the Mississippi River each year. Most of this freight was carried on large barges pushed by tugboats. The upper Mississippi traffic was predominantly composed of agricultural products such as wheat, corn, and soybeans. Coal and steel freight traveled down the Ohio River and onto the lower Mississippi River. At Baton Rouge, Louisiana, petroleum, petrochemical products, and aluminum joined the freight being moved south. It is at this point that the depth of the Mississippi River increases, allowing for larger ships to traverse upriver to this point.


People living along the Mississippi River are well aware of the flooding potential of the river. During de Soto's exploration of the Mississippi, he noted much flooding. Evidence from Native American Mississippi Valley settlement locations (on higher land) and the creation of mounds on which they placed their dwellings indicate Native American awareness of and adaptation to flooding of the Mississippi. Significant flooding of the Mississippi Valley in 1927 prompted national discussion of flood control along the Mississippi. Other severe flooding events occurred in 1937, 1965, 1973, 1982, and 1993. The severe flooding in 1993 is considered to be the most devastating in recorded U.S. history. It affected the upper and middle Mississippi Valley from late June until mid-August 1993 with record levels on the Mississippi River and most of its tributaries from Minnesota to Missouri. At St. Louis, the river remained above flood stage for over two months and crested at 49.6 feet (19 feet above flood stage). Industry and transportation along the Mississippi were virtually at a standstill during the summer months of 1993. In all, over 1,000 of the 1,300 levees in the Mississippi River system failed, over 70,000 people were displaced, nearly 50,000 homes were either destroyed or damaged, 12,000 square miles of agricultural land was unable to be farmed, and 52 people died. Fortunately, larger cities along the Mississippi remained protected by floodwalls. The cost of the flood was enormous. Most estimates of total flood damage run to nearly $20 billion. Flood events are certain to remain a part of life along the Mississippi River.

Human Influence

Humans have influenced the flow of the Mississippi and the quality of its water. Historically, the river and its tributaries meandered across the floodplain, and erosion, sedimentation, and flooding were natural processes. During the twentieth century, however, humans interrupted these processes. In the 1930s, twenty-nine navigation dams were built between St. Louis and Minneapolis. These dams impound the water to improve navigation. One cost of damming, however, is increased retention of sediment in the river. Flood-control levees have been built in order to manage the seasonal flooding. Much of the Mississippi floodplain has been converted to agriculture. This change has two serious consequences for the Mississippi River. First, the loss of prairie wetlands and floodplain forest decreases the biodiversity of the region. Second, conversion of land to agriculture often leads to increased run off of fertilizers and pesticides. The presence of high rates of nitrogen and phosphorus can be directly attributed to farming practices in the Mississippi Valley. At the end of the twentieth century, many experts suggested that agricultural pollution in the Mississippi River was directly responsible for the creation of the "dead zone," an area in the Gulf of Mexico where there is little aquatic life due to abnormally low levels of oxygen.

Industrial pollution is also a concern along the Mississippi River. Industries have contributed significant amounts of oil, aluminum, lead, and other industrial wastes such as sulfur dioxide, hydrogen sulfide, and benzene to the flow of the Mississippi. A study in 2000 estimated that 58 million pounds of toxic discharge travels down the Mississippi annually. At the turn of the twenty-first century, much of the river remained unswimmable and unfishable, despite the fact that it serves as the primary source of drinking water for 18 million people. Growing awareness of environmental processes and increased concern for the state of the Mississippi River system that began during the last decade of the twentieth century may prove to have a positive influence in the life of the great river.


Badt, Karin. The Mississippi Flood of 1993. Chicago: Children's Press, 1994.

Geus, Theodor. The Mississippi. Lexington: University Press of Kentucky, 1989.

Haites, Erik, James Mak, and Gary Walton. Western River Transportation: The Era of Early Internal Development, 1810–1860. Baltimore: Johns Hopkins University Press, 1975.

Lauber, Patricia. Flood: Wrestling with the Mississippi. Washington, D.C.: National Geographic Society, 1996.

Janet S.Smith

See alsoMexico, Gulf of ; Missouri River ; River Navigation ; Water Pollution ; Water Supply and Conservation .

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Mississippi, river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri, the chief of its numerous tributaries. The combined Missouri-Mississippi system (from the Missouri's headwaters in the Rocky Mts. to the mouth of the Mississippi) is c.3,740 mi (6,020 km) long and ranks as the world's third longest river system after the Nile and the Amazon. With its tributaries, the Mississippi drains c.1,231,000 sq mi (3,188,290 sq km) of the central United States, including all or part of 31 states and c.13,000 sq mi (33,670 sq km) of Alberta and Saskatchewan in Canada. Cotton and rice are important crops in the lower Mississippi valley; sugarcane is raised in the delta. The Mississippi is abundant in freshwater fish; shrimp are taken from the briny delta waters. The delta also yields sulfur, oil, and gas.

Course and Navigation

The Mississippi River rises in small streams that feed Lake Itasca (alt. 1,463 ft/446 m) in N Minnesota and flows generally south to enter the Gulf of Mexico through a huge delta in SE Louisiana. A major economic waterway, the river is navigable from the sediment-free channel maintained through South Pass in the delta to the Falls of St. Anthony in Minneapolis, with canals circumventing the rapids near Rock Island, Ill., and Keokuk, Iowa. For the low-water months of July, August, and September, there is a 45-ft (13.7-m) channel navigable by oceangoing vessels from Head of the Passes to Baton Rouge, La., and a 9-ft (2.7-m) channel from Baton Rouge deep enough for barges and towboats to Minneapolis. The Mississippi connects with the Intracoastal Waterway in the south and with the Great Lakes–St. Lawrence Seaway system in the north by way of the Illinois Waterway.

Along the river's upper course shipping is interrupted by ice from December to March; thick, hazardous fogs frequently settle on the cold waters of the unfrozen sections during warm spells from December to May. In its upper course the river is controlled by numerous dams and falls c.700 ft (210 m) in the 513-mi (826-km) stretch from Lake Itasca to Minneapolis and then falls c.490 ft (150 m) in 856 mi (1,378 km) from Minneapolis to Cairo, Ill. The Mississippi River receives the Missouri River 17 mi (27 km) N of St. Louis and expands to a width of c.3,500 ft (1,070 m); it swells to c.4,500 ft (1,370 m) at Cairo, where it receives the Ohio River. The stretch of the river from the last dam and locks, above St. Louis, to Cairo is also known as the middle Mississippi.

The lower Mississippi meanders in great loops across a broad alluvial plain (25–125 mi/40–201 km wide) that stretches from Cape Girardeau, Mo., to the delta region S of Natchez, Miss. The plain is marked with oxbow lakes and marshes that are remnants of the river's former channels. Natural levees, built up from sediment carried and deposited in times of flood, border the river for much of its length; sediment has also been deposited on the riverbed, so that in places the surface of the Mississippi is above that of the surrounding plain, as evidenced by the St. Francis, Black, Yazoo, and Tensas river basins. Breaks in the levees frequently flood the fertile bottomlands of these and other low-lying areas of the plain.

The Mississippi Delta

After receiving the Arkansas and Red rivers, the Mississippi enters a birdsfoot-type delta, which was built outward by sediment carried by the main stream since c.AD 1500 It then discharges into the Gulf of Mexico through a number of distributaries, the most important being the Atchafalaya River and Bayou Lafourche. The main stream continues southeast through the delta to enter the gulf through several mouths, including Southeast Pass, South Pass, and Pass à Loutre. Indications that the Mississippi River might abandon this course and divert through the Atchafalaya River led to the construction of a series of dams, locks, and canals by the U.S. Army Corps of Engineers. Known as the Old River Control Structure, it was undertaken to prevent such an occurrence. Sluggish bayous and freshwater lakes (such as Pontchartrain, Grand, and Salvador) dot the delta region.

Regarding the delta, environmentalists and those in the seafood industry are concerned by the loss of 25–45 sq mi (65–104 sq km) of marsh a year; fish and wildlife populations are threatened as their natural habitat slowly disappears. The loss has been attributed to subsidence and a decrease in sediment largely due to dams, artificial channeling, and land conservation measures. Pollution and the cutting of new waterways for petroleum exploration and drilling have also taken their toll on the delta. Louisiana has enacted environmental protection laws that are expected to slow, but not halt, the loss of the delta marshes.

Attempts at Flood Control

The flow of the river is greatest in the spring, when heavy rainfall and melting snow on the tributaries (especially the Missouri and the Ohio) cause the main stream to rise and frequently overflow its banks and levees, inundating vast areas of the plain. Since the disastrous flood of 1927 the U.S. Congress has authorized the construction of dams on the upper Mississippi and its tributaries to regulate the flow; the building of c.1,600 mi (2,580 km) of levees below Cape Girardeau to contain the swollen river; and the establishment of floodways to divert water at critical points, such as the Cairo–New Madrid, Atchafalaya, and Morganza floodways and the Bonnet Carre Spillway at New Orleans, which diverts water into Lake Pontchartrain. Cutoffs have eliminated the dangerous winding channels, and an improved main channel has increased the river's flood-carrying capacity. A 220-acre (89-hectare) model of the Mississippi River basin is located at Clinton, Miss., which has been used by the U.S. Corps of Engineers to simulate various conditions in the basin.

Nonetheless, serious, record-breaking floods again occurred in the rainy spring of 1973, when the river crested at St. Louis at 43.3 ft (13.2 m), and again in the summer of 1993, when the river crested at St. Louis at 49.6 ft (15.1 m), killing 50 people, displacing 50,000, and causing $12 billion in agricultural and property damage. In the spring of 2011, heavy rains in April in the S central Mississippi river basin led to near-record high water and flooding from parts of Missouri and Illinois south. The narrow river channel that has been created by building levees has worsened flooding in some instances.

In 1988 a severe drought brought water levels down to their lowest point in recorded history and halted most river traffic. Severe drought again threatened to halt traffic in the middle Mississippi in 2012–13, but dredging and other channel deepening measures kept the river open.


The Spanish explorer Hernando De Soto is credited with the European discovery of the Mississippi River in 1541. The French explorers Jacques Marquette and Louis Jolliet reached it through the Wisconsin River in 1673, and in 1682 La Salle traveled down the river to the Gulf of Mexico and claimed the entire territory for France. The French founded New Orleans in 1718 and effectively extended control over the upper river basin with settlements at Cahokia, Kaskaskia, Prairie du Chien, and St. Louis. France ceded the river to Spain in 1763 but regained it in 1800; the United States acquired the Mississippi River as part of the Louisiana Purchase in 1803.

A major artery for the Native Americans and the fur-trading French, the river became in the 19th cent. the principal outlet for the newly settled areas of mid-America; exports were floated downstream with the current, and imports were poled or dragged upstream on rafts and keelboats. The first steamboat plied the river in 1811, and successors became increasingly luxurious as river trade increased in profitability and importance; the era is colorfully described in Mark Twain's Life on the Mississippi (1883).

Traffic from the north ceased after the outbreak of the Civil War. During the Civil War the Mississippi was an invasion route for Union armies and the scene of many important battles. Especially decisive were the capture of New Orleans (1862) by Adm. David Farragut, the Union naval commander, and the victory of Union forces under Grant at Vicksburg in 1863. River traffic resumed after the war, but much of the trade was lost to the railroads. With modern improvements in the channels of the river there has been a great increase in traffic, especially since the mid-1950s, with principal freight items being petroleum products, chemicals, sand, gravel, and limestone.


See B. Keating, The Mighty Mississippi (1971); P. V. Scarpino, Great River: An Environmental History of the Upper Mississippi (1985); M. M. Smart et al., ed., Ecological Perspectives of the Upper Mississippi River (1986); J. M. Barry, Rising Tide: The Great Mississippi Flood of 1927 and How It Changed America (1997); C. Morris, The Big Muddy (2012); P. Schneider, Old Man River (2013).

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The Mississippi River and its basin are vital components of America's natural environment. In addition, they have had a vital shaping influence upon the history of North American Indians, exploration, military campaigns, pioneering and settlement, politics, folk and high culture, civil rights, and economic development.

The Mississippi River drains the North American continent from its headwaters in Lake Itasca, Minnesota, to the Gulf of Mexico. Home to diverse and distinctive species of flora and fauna, it was first civilized between 500 ad and 1500 ad by agrarian, mound-building Mississippian Indians. Beginning in 1541, European explorers, traders, and adventurers traversed the Mississippi Valley in the service of Spain; France; Britain; and later, the United States. Before losing the Upper Mississippi Valley and Canada to Britain in 1763, France briefly delivered its claims to the Louisiana Territory to Spain. France regained Louisiana in 1802, only to sell it to the Americans in 1803. The Louisiana Purchase ended an eighteen-year dispute, at last opening the rich port city of New Orleans to American rivermen and seaman.

From the Revolution onward, the Mississippi River witnessed a microcosm of American history. Revolutionary militia general George Rogers Clark fought at Kaskaskia, in Illinois country, in 1778; Lewis and Clark wintered on the Mississippi in 1803–1804 on their way to explore Thomas Jefferson's Louisiana Purchase; Andrew Jackson defeated the British at New Orleans in 1815; the Missouri Compromise debate of 1819–1821 over the status of slavery west of the river polarized America into proslavery and antislavery forces; Chief Black Hawk's 1832 defeat in Illinois, followed by the forced march of the Cherokees across the frozen Lower Mississippi, marked the extirpation of America's woodland Indians; Mormon prophet Joseph Smith was murdered at Nauvoo, Illinois, in 1844; Ulysses S. Grant turned the tide of the Civil War at Vicksburg, Mississippi, in 1863; and American life was forever marked by the eras of Mississippi Valley slavery, the Jim Crow laws there, and the civil rights revolution of the 1950s and 1960s.

The economic history of the Mississippi River is one of technological innovation, beginning with Indian canoes and frontier keelboats and flatboats, moving into the steamboat age, and culminating in the twentieth-century development of diesel-powered towboat and barge commerce along the mighty river's banks. The first Mississippi rivermen were Indians, paddling their sleek, wooden canoes and crude "bullboats" up and down its waters. Immediately following the American Revolution, keelboatmen steered sleek, prowed, sixty-foot-long craft swiftly downstream and then worked very hard to inch cargoes of coffee, sugar, and other trade goods upstream. The introduction in 1811 of steamboats on the western rivers, however, quickly ran the keelboats out of business.

Interestingly, the crude, inexpensive nonsteam flatboat (introduced in the late 1700s) endured well past the advent of steam power and the Civil War. Flatboats were flat-bottomed, box-shaped craft averaging fifty feet in length and twelve feet in width. Flatboats carried pork, corn, furs, hardy fruits and vegetables, and whiskey downstream only. Having sold their loads and boats (as scrap lumber), flatboatmen walked home along the dangerous Natchez Trace route or, after 1811, purchased deck passage aboard northbound steamers.

The keelboat and flatboat workers did not always conform to the rough, tough "alligator horse" image portrayed in folktales and published stories about Mississippi River heroes like Davy Crockett (1786–1836) and Big Mike Fink (1770?–1823), the "king of the river." Many early boatmen were coarse and violent frontiersmen, but as time progressed a boating workforce emerged, characterized by more civilized family men and young farm boys. The average nonsteam riverman was a white Ohio and Mississippi Valley male of English or Celtic ancestry, averaging twenty-eight years of age. Antebellum and postbellum lumber raft crews—navigating large log assemblages down the Ohio and Mississippi Rivers—fit most of this description except that this group included more Scandinavian American raftsmen.

The workaday Mississippi steamboat was a small (approximately three-hundred-ton) craft exhibiting little gilt or fancy trappings. As with flatboat and keelboat commerce, peak steamboat shipping time was during high water; the high waters of late fall and early spring greatly reduced the chances of running aground. At those times, the Mississippi was dotted with steamers, crewed by both white and African American boatmen and carrying pork, whiskey, lead, tobacco, cotton, and ticketed passengers. By the 1850s, however, the railroads had proved the steamboat's economic undoing. The steamers were ultimately succeeded in 1903 by screw-propellered, steam- and, later, diesel-powered "towboats" pushing fleets of lashed river barges up and downstream.

In the realm of American culture and arts, the Mississippi River valley has proved seminal to the work of authors ranging from Mark Twain (1835–1910) to William Faulkner (1897–1962). Its environment, wildlife, and working folk have been painted by George Caleb Bingham (1811–1879), John James Audubon (1785–1851), and Karl Bodmer (1809–1893). And every indigenous form of American music—gospel, blues, country, jazz, and rock and roll—was born along the banks of, and aboard, the boats plying this great river.

Twain, once a steamboat pilot, referred to the Mississippi River valley as "the heart of America." In all aspects of American culture, the Mississippi River and its people reflect the core of the American experience.

See alsoBlount Conspiracy; Environment, Environmental History, and Nature; Frontier; Louisiana Purchase; New Orleans; Revolution: Diplomacy; Spanish Conspiracy; Steamboat .


Allen, Michael. Western Rivermen, 1763–1861: Ohio and Mississippi Boatmen and the Myth of the Alligator Horse. Baton Rouge: Louisiana State University Press, 1990.

Baldwin, Leland D. The Keelboat Age on Western Waters. Pittsburgh, Pa.: University of Pittsburgh Press, 1941.

Haites, Eric F., James Mak, and Gary M. Walton. Western River Transportation: The Era of Early Internal Development, 1810–1860. Baltimore: Johns Hopkins University Press, 1975.

Hunter, Louis C. Steamboats on the Western Rivers: An Economic and Technological History. Cambridge, Mass.: Harvard University Press, 1949. Reprint, New York: Dover Publications, 1993.

Saxon, Lyle. Father Mississippi. New York: Century, 1927.

Twain, Mark. Life on the Mississippi. Boston: Osgood, 1883. Reprint, New York: Oxford University Press, 1990.

Michael Allen

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The Mississippi River is a principal United States river. It originates in central Minnesota and flows southeast and then south, eventually reaching Louisiana where it pours into the Gulf of Mexico. States lying west of the Mississippi are Iowa, Missouri, and Arkansas, Louisiana, and Minnesota; to the east are Wisconsin, Illinois, Kentucky, Tennessee, and Mississippi. The river is 2,340 miles (3,765 kilometers) long. With the Missouri River, the Mississippi forms the world's third-longest river system. It is navigable by ocean-going vessels from the Gulf to Baton Rouge, Louisiana. North of that location, it is navigable by barges and towboats as far as Minneapolis, Minnesota.

The mighty Mississippi was first sighted by explorers in 154041 when Spaniard Hernando de Soto (1500?42) ventured through the southern region. In 167273 the Mississippi's upper reaches were seen by French-Canadian explorer Louis Jolliet (16451700) and French missionary Jacques Marquette(163775). In 1682 French explorer Sieur de La Salle (164387) investigated the lower part and claimed the entire region for France, naming it Louisiana in honor of King Louis XIV (16381715).

After 1763, at the end of the French and Indian War, (175463), the river became the boundary between British possessions to the east and Spanish possessions to the west, and the river itself was ceded to Spain. Disputes between Spain and the United States over the waterway were settled in the Pinckney Treaty (1795). With the Louisiana Purchase (1803), the river passed into American control.

In 1811 the steamboat era began on the Mississippi River. Traffic along the Mississippi sped the development of the nation by providing access to the interior territories. St. Louis, Missouri; Memphis, Tennessee; and New Orleans, Louisiana, all flourished as a result of riverboat traffic. In the imagination of most U.S. citizens, the romance of the Mississippi as a steamboat waterway is probably best captured by Missouri-born writer Mark Twain (18351910) in his novel, The Adventures of Huckleberry Finn (1884).

See also: Louisiana, Missouri River, Natchez Trace, New Orleans, Pinckney Treaty, Steamboats, Steamboat Act of 1852

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Mississippi Principal river of the USA, second-longest national river (after the Missouri), c.3780km (2350mi) long. It rises in nw Minnesota and flows se (forming many state boundaries along its course), emptying into the Gulf of Mexico via its huge marshland delta in se Louisiana. Its chief tributaries include the Missouri, Ohio, Arkansas, and Tennessee rivers. A major transport route, it connects to the Great Lakes and the St Lawrence Seaway (n), and the Intracoastal Waterway (e). Major ports on the river include Minneapolis, St Louis, Memphis, and New Orleans. In 1541, Hernando De Soto became the first European to discover the river. In 1682, La Salle sailed down the Mississippi to the Gulf of Mexico and gained control of the region. In 1803, the USA acquired it as part of the Louisiana Purchase. Since the 1950s, improvements to the river's channels enabled bulkier freight to be transported.

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Mississippi, river, c.100 mi (160 km) long, rising E of the Kawartha Lakes, S Ont., Canada, and flowing NE through Mississippi Lake, then N to the Ottawa River near Arnprior. It is navigable for small steamers.