9 articles
Little Missouri
Little Missouri River: name of two U.S. rivers. The northern one drains 21,500 km² of Wyoming, Montana, and the Dakotas, flows through Theodore Roosevelt National Park to Lake Sakakawea; the Arkansas one joins the Ouachita River.
Lower Mississippi
Lower Mississippi: the 1,535-km unimpounded reach of the Mississippi River from the Ohio River confluence at Cairo, Illinois to the Gulf of Mexico; heavily leveed floodplain, over 90% floodplain loss, delta restoration efforts.
Niobrara
The Niobrara is a river in northern Nebraska flowing east to the Missouri River, with 76 miles designated as a national scenic river in 1991.
North Platte
North Platte River, tributary of the Platte River rising in northern Colorado, looping 350 miles through southeast Wyoming to Nebraska; snowmelt-fed, dammed by seven Bureau of Reclamation reservoirs, irrigating over 440,000 acres.
South Platte
The South Platte River is a major tributary of the Platte River that rises in the Colorado Rockies, flows through Denver, and joins the North Platte in Nebraska.
Teays - Old Ohio
Teays - Old Ohio (FEOW ecoregion 150) is a Nearctic temperate upland rivers freshwater ecoregion covering the Ohio River watershed across ten US states, named for the preglacial Teays River, with 208 fish and 122 mussel species.
Upper Mississippi
Upper Mississippi: river reach from Lake Itasca, Minnesota, to the Ohio River confluence at Cairo, Illinois; with the Illinois River it forms the 1,300-mile UMRS, a 1986-designated national ecosystem and 9-foot-channel navigation system.
Upper Missouri
The Upper Missouri refers to the upper portion of the Missouri River and its basin, spanning Montana, Wyoming, the Dakotas, and Nebraska down to the Missouri–Platte confluence near Omaha.
Wabash
The Wabash River is a 764 km tributary of the Ohio River rising in western Ohio and crossing Indiana, whose lower two-thirds is the longest undammed river reach east of the Mississippi.