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The Mississippi River [b] is the primary river, and second-longest 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.
A water resource region is the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units as part of the U.S. hydrologic unit system . This first level of classification divides the United States into 21 major geographic areas, or regions.
The Mississippi Headwaters subregion, sometimes called the Mississippi Headwaters Hydrologic Subregion, is a second-level subdivision [1] covering approximately 20,200 sq mi (52,000 km 2) and includes the Mississippi River basin above the confluence with the St. Croix River basin, excluding the Minnesota River basin. [2]
In terms of geologic and hydrographic history, the Upper Mississippi east and south of Fort Snelling is a portion of the now-extinct Glacial River Warren which carved the valley of the Minnesota River, permitting the immense Glacial Lake Agassiz to join the world's oceans at the Gulf of Mexico. The collapse of ice dams holding back Glacial Lake ...
The Upper Mississippi water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the ...
Since at least mid-September, every water level gauge along a nearly 400-mile stretch of the Mississippi from the Ohio River to Jackson, Mississippi, has been at or below the low-water threshold ...
Norman's chart of the lower Mississippi River is a historically significant map produced in 1858 of landmarks, roads, ferry crossings, and plantations along the course of the Mississippi River from Natchez to New Orleans. Cotton and sugar plantations are color-coded with distinct colors.