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The Mississippi River [b] is the primary river of the largest drainage basin in the United States. [c] [15] [16] From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for 2,340 miles (3,766 km) [16] to the Mississippi River Delta in the Gulf of Mexico.
The Mississippi River System, also referred to as the Western Rivers, is a mostly riverine network of the United States which includes the Mississippi River and connecting waterways. The Mississippi River is the largest drainage basin in the United States. [3] In the United States, the Mississippi drains about 41% of the country's rivers. [4]
USACE Mississippi Valley Division, shown in blue. The United States Army Corps of Engineers Mississippi Valley Division (MVD) is responsible for the Corps water resources programs within 370,000-square-miles of the Mississippi River Valley, as well as the watershed portions of the Red River of the North that are within the United States.
The Upper Mississippi River is the portion of the Mississippi River upstream of St. Louis, Missouri, United States, [1] a city at the confluence of its main tributary, the Missouri River. [ citation needed ] Historically, it may refer to the area above the Arkansas Post , above the confluence of Ohio River , or above Cape Girardeau .
The Upper Mississippi River Valley AVA is an American Viticultural Area covering 29,914 square miles (77,477 km 2; 19,144,960 acres) located along the Upper Mississippi River and its tributaries in northwest Illinois, northeast Iowa, southeast Minnesota and southwest Wisconsin.
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The Mississippi embayment represents a break in what was once a single, continuous mountain range comprising the modern Appalachian range, which runs roughly on a north–south axis along the Atlantic coast of the United States, and the Ouachita range, which runs on a rough east–west axis west of the Mississippi River.
The political and engineering focus in the 20th century was to separate the Lower Mississippi River from its floodplain.Levees and channelization—along with substantial loss of bottomland forests to agriculture in the alluvial valley—have resulted in a loss of wildlife and fish habitat, decreased water quality, and an expansion of the hypoxic zone in the Gulf of Mexico.