Ohio River

Major river in the midwestern United States / From Wikipedia, the free encyclopedia

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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 in a southwesterly direction from western Pennsylvania 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, which 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 five million people.[3]

Quick facts: Ohio River, Location, Country, States, Cities...
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 Louisville and Portland Canal.
Ohio River basin
CountryUnited States
StatesPennsylvania, Ohio, West Virginia, Kentucky, Indiana, Illinois, Missouri (through the Mississippi River)
CitiesPittsburgh, PA, East Liverpool, OH, Wheeling, WV, Parkersburg, WV, Huntington, WV, Ashland, KY, Portsmouth, OH, Cincinnati, OH, Louisville, KY, Owensboro, KY, Evansville, IN, Henderson, KY, Mount Vernon, IN, 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 (1951–1980)[1]
  average281,000 cu ft/s (8,000 m3/s)(1951–1980)[1]
  maximum1,850,000 cu ft/s (52,000 m3/s)
Basin features
ProgressionMississippi 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 river became a primary transportation route for pioneers during the westward expansion of the early U.S. The lower Ohio River just below Louisville was 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) restricting larger commercial navigation, although in the 18th and early 19th century its three deepest channels could be traversed by a wide variety of craft then in use. In 1830, the Louisville and Portland Canal (now the McAlpine Locks and Dam) bypassed the rapids, allowing 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. Since the "canalization" of the river in 1929, the Ohio has not been a natural free-flowing river; today, it is divided into 21 discrete pools or reservoirs by 20 locks and dams for navigation and power generation.[4]

The name "Ohio" comes from the Seneca, Ohi:yo', lit. "Good River".[5] 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."[6]

After the French and Indian War, Britain's trans-Appalachian Indian Reserve was divided by the river into colonial lands to the south and Native American lands to the north. In the late 18th century, the river became the southern boundary of the Northwest Territory. 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. Today, the Ohio River is one of the most polluted rivers in the United States. In winter, it regularly freezes over at Pittsburgh but rarely farther south towards Cincinnati and Louisville. Further down the river in places like Paducah and Owensboro, Kentucky, closer to its confluence with the Mississippi, the Ohio is ice-free year-round.