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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 ...
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.
3.690 Mm – length of the Volga river, longest in Europe; 4.000 Mm – length of the Kalahari Desert; 4.350 Mm – length of the Yellow River; 4.600 Mm – width of the Mediterranean Sea; 4.800 Mm – length of the Sahara; 4.800 Mm – widest width of Atlantic Ocean (U.S.-Northern Africa) 5.100 Mm – distance from Dublin to New York as the ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
River mile numbers begin at zero and increase further upstream. The corresponding metric unit using kilometers is the river kilometer. They are analogous to vehicle roadway mile markers, except that river miles are rarely marked on the physical river; instead they are marked on navigation charts, and topographic maps. Riverfront properties are ...