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The Ohio water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage ...
The Ohio River at Cairo is 281,500 cu ft/s (7,960 m 3 /s); [1] and the Mississippi River at Thebes, Illinois, which is upstream of the confluence, is 208,200 cu ft/s (5,897 m 3 /s). [66] The Ohio River flow is greater than that of the Mississippi River, so hydrologically the Ohio River is the main stream of the river system.
The Allegheny River (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a 325-mile-long (523 km) tributary of the Ohio River that is located in western Pennsylvania and New York in the United States.
The Ohio River roughly bisects the Unglaciated Allegheny Plateau in generally a north-northeast to south-southwest direction. Other significant rivers in the plateau include the Muskingum River and Tuscarawas River in Ohio, the Youghiogheny River and Allegheny River in Pennsylvania, and the Monongahela River and Kanawha River in West Virginia.
This is a list of locks and dams of the Ohio River, which begins at the confluence of the Allegheny and Monongahela rivers at The Point in Pittsburgh, Pennsylvania and ends at the confluence of the Ohio River and the Mississippi River, in Cairo, Illinois. A map and diagram of U.S. Army Corps of Engineers operated locks and dams on the Ohio River.
Downstream of Youngstown, Ohio through Struthers and Lowellville in Ohio and Edinburg in Pennsylvania, the river runs through a significant valley. In contrast and notwithstanding some shallow reservoirs and short waterfalls, the river upstream of there flowing through Newton Falls and Warren encounters less relief in the ground and the terrain is largely flat right up to the riverbank.
USGS Hydrologic Unit Map - State of Pennsylvania (1974) Shaw, Lewis C. (June 1984). Pennsylvania Gazetteer of Streams Part II (Water Resources Bulletin No. 16). Prepared in Cooperation with the United States Department of the Interior Geological Survey (1st ed.).
The rivers in the northern part of the state drain into the northern Atlantic Ocean via Lake Erie and the St. Lawrence River, and the rivers in the southern part of the state drain into the Gulf of Mexico via the Ohio River and then the Mississippi. The worst weather disaster in Ohio history occurred along the Great Miami River in 1913. Known ...