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Platte,river, c.310 mi (500 km) long, formed by the confluence of the North Platte (680 mi/1,090 km long) and South Platte (430 m/690 km) rivers at North Platte, Neb. It flows generally E across S Nebraska to join the Missouri River at Plattsmouth, Neb. The river is too flood-prone in spring and too shallow and braided the rest of the year for navigation. Much of its water and the water of its tributaries is diverted for irrigation, municipal uses, and hydroelectric power production. Large congregrations of sandhill cranes rest along the river in central S Nebraska during their migration. The Platte valley was an important route to the West in the 19th cent.; the Mormon Trail followed the north bank, and the Oregon Trail followed the south bank.
a river in the USA, a right tributary of the Missouri. Formed by the confluence of the North Platte and South Platte rivers, it originates on the Front Range of the Rocky Mountains. The river measures 510 km from the confluence of its sources and 1,415 km from the source of the North Platte; it drains an area of 241,000 sq km. There is high water in spring from melting snow, and a low water period in summer. The mean annual flow rate at the mouth is 150 cu m per sec. The river is used for irrigation. On the North Platte are the large Seminoe and Pathfinder reservoirs as well as hydroelectric power stations; the city of Denver is situated on the South Platte.