Ohio River

The Ohio River is a 981-mile (1,579 km) long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from far-western Pennsylvania south of Lake Erie to its mouth on the Mississippi River at the southern tip of Illinois. It is the third largest river by discharge volume in the United States and the largest tributary by volume of the north-south flowing Mississippi River that divides the eastern from western United States.[2] It is also the 6th oldest river on the North American continent. The river flows through or along the border of six states, and its drainage basin includes parts of 14 states. Through its largest tributary, the Tennessee River, the basin includes several states of the southeastern U.S. It is the source of drinking water for three million people.[3]

Ohio River
The widest point on the Ohio River is just north of downtown Louisville, where it is one mile (1.6 km) wide. Indiana is on the right towards the flood gates, Kentucky on the left, towards the locks. The jetty on the left is the entrance to the Portland and Louisville Canal.
Ohio River basin
CountryUnited States
StatesPennsylvania, Ohio, West Virginia, Kentucky, Indiana, Illinois
CitiesPittsburgh, PA, East Liverpool, OH, Wheeling, WV, Parkersburg, WV, Huntington, WV, Ashland, KY, Cincinnati, OH, Louisville, KY, Owensboro, KY, Evansville, IN, Henderson, KY, Paducah, KY, Cairo, IL
Physical characteristics
SourceAllegheny River
  locationAllegany Township, Potter County, Pennsylvania
  coordinates41°52′22″N 77°52′30″W
  elevation2,240 ft (680 m)
2nd sourceMonongahela River
  locationFairmont, West Virginia
  coordinates39°27′53″N 80°09′13″W
  elevation880 ft (270 m)
Source confluence 
  locationPittsburgh, Pennsylvania
  coordinates40°26′32″N 80°00′52″W
  elevation730 ft (220 m)
MouthMississippi River
at Cairo, Illinois / Ballard County, Kentucky
36°59′12″N 89°07′50″W
290 ft (88 m)
Length981 mi (1,579 km)
Basin size189,422 sq mi (490,600 km2)
  locationCairo, Illinois(1951–80)[1]
  average281,000 cu ft/s (8,000 m3/s)(1951–80)[1]
  maximum1,850,000 cu ft/s (52,000 m3/s)
Basin features
ProgressionOhio River → Mississippi RiverGulf of Mexico
  leftLittle Kanawha River, Kanawha River, Guyandotte River, Big Sandy River, Little Sandy River, Licking River, Kentucky River, Salt River, Green River, Cumberland River, Tennessee River
  rightBeaver River, Little Muskingum River, Muskingum River, Little Hocking River, Hocking River, Shade River, Scioto River, Little Miami River, Great Miami River, Wabash River

The lower Ohio River just below Louisville is obstructed by rapids known as the Falls of the Ohio where the elevation falls 26 feet (7.9 m) in 2 miles (3.2 km) and was impassable for larger commercial navigation, although in the 18th and early 19th century its three deeper channels could be traversed by a wide variety of craft then in use, depending on seasonal water level. Completion of the Louisville and Portland Canal in 1830 (and later the McAlpine Locks and Dam), bypassing the rapids, allowed even larger commercial and modern navigation from the Forks of the Ohio at Pittsburgh to the Port of New Orleans at the mouth of the Mississippi on the Gulf of Mexico.

The name "Ohio" comes from the Seneca, Ohi:yo', lit. "Good River".[4] In his Notes on the State of Virginia published in 1781–82, Thomas Jefferson stated: "The Ohio is the most beautiful river on earth. Its current gentle, waters clear, and bosom smooth and unbroken by rocks and rapids, a single instance only excepted."[5] In the late 18th century, the river was the southern boundary of the Northwest Territory. It became a primary transportation route for pioneers during the westward expansion of the early U.S. Today, the Ohio River is one of the most polluted rivers in the United States.

The river is sometimes considered as the western extension of the Mason–Dixon Line that divided Pennsylvania from Maryland, and thus part of the border between free and slave territory, and between the Northern and Southern United States or Upper South. Where the river was narrow, it was crossed by thousands of slaves escaping to the North for freedom; many were helped by free blacks and whites of the Underground Railroad resistance movement.

The Ohio River is a climatic transition area, as its water runs along the periphery of the humid subtropical and humid continental climate areas. It is inhabited by fauna and flora of both climates. In winter, it regularly freezes over at Pittsburgh but rarely farther south toward Cincinnati and Louisville. In places like Paducah, Kentucky and Owensboro, Kentucky in the South near the Ohio's confluence with the Mississippi, it is ice-free year-round.

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