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The uppermost lock and dam on 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.
It flows west to east starting in Colorado and dumping into the Mississippi River. Its length of 1,469 miles (2,364 km) allows it to flow through Colorado, Kansas, Oklahoma, and Arkansas. It is the sixth-longest river in the US, the second-longest tributary to the Mississippi River System, and the 45th longest river in the world. [11]
Stream gradient may change along the stream course. An average gradient can be defined, known as the relief ratio, which gives the average drop in elevation per unit length of river. [4] The calculation is the difference in elevation between the river's source and the river terminus (confluence or mouth) divided by the total length of the river ...
The Mississippi River is a unique creature. It’s an inland sea perpetually on the move. It drains a continent. It gathers other great rivers into its fold and flows forever on. It has countless ...
Alternate title: From Natchez to New Orleans. Hand colored. Cadastral map showing landowners. LC copy 2 imperfect: Pieces missing primarily along outside margin and discolored. Shows plantations with names of owners. LC copy 3 in Maps of the Mississippi River exhibit, Nov. 1973-Jan. 1974, no. 29.
When the length of a river is followed by an asterisk, it is an average of multiple information sources. If the difference in lengths between given information sources is significant, all lengths are listed. But if the lengths from secondary information sources are similar, they are averaged and that figure has an asterisk.
The locks can generally be categorized by three different sizes, as expressed by length. About 15 percent of the lock chambers are 1,000 to 1,200 ft (300 to 370 m) long, 60 percent are 600 to 999 ft (183 to 304 m) long, and 25 percent are less than 600 feet (180 m) long. Lock widths are mostly 110 feet (34 m).
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