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The longest rivers of the United States include 38 that have main stems of at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted to its tributaries". [1]
The Missouri River is a river in the Central and Mountain West regions of the United States.The nation's longest, [13] it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Mountains of southwestern Montana, then flows east and south for 2,341 miles (3,767 km) [6] before entering the Mississippi River north of St. Louis, Missouri.
Missouri River – 2,340 miles (3,770 km) Mississippi River – 2,320 miles (3,730 km) White River – 722 miles (1,162 km) Des Moines River – 525 miles (845 km) St. Francis River – 426 miles (686 km) Black River – 300 miles (480 km) Gasconade River – 280 miles (450 km) Osage River – 276 miles (444 km) Meramec River – 229 miles (369 km)
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, 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. [57] [58]
Length Average discharge Outflow miles km cu ft/s m 3 /s 1 Mississippi River: 2,320: 3,730: ... Missouri River: 2,341 [2] 3,767 [2]
For example, due to 18 cutoffs created between 1766 and 1885, the length of the Mississippi River from Cairo, Illinois, to New Orleans, Louisiana, was reduced by 351 kilometres (218 miles). [10] These points make it difficult, if not impossible, to get an accurate measurement of the length of a river.
In St. Joseph, moderate flooding occurred as the Missouri River rose to 22.6 feet. The river was expected to crest at 24.1 feet Thursday morning and fall below flood stage, 17 feet, early Monday.
The Upper Mississippi River covers approximately half of the Mississippi River's length. About 850 miles (1,370 km) of the river is navigable from Minneapolis-St. Paul (specifically, the Coon Rapids Dam in the City of Coon Rapids, MN) to the Ohio River. The river sustains a large variety of aquatic life, including 127 species of fish and 30 ...