20 Facts About The Ohio

The Ohio River is a 981-mile long river in the United States.

The Ohio River is a climatic transition area, as its water runs along the periphery of the humid subtropical and humid continental climate areas.

In 1749, the Ohio Company was established in the Thirteen Colonies to settle and trade in the Ohio River region.

Lord Dunmore's War south of the Ohio river contributed to cession of land north to Quebec to prevent colonial expansion onto Native American territory.

The Ohio River flowed westward, it became a convenient means of westward movement by pioneers traveling from western Pennsylvania.

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The need for access to the port of New Orleans by settlers in the Ohio Valley is one of the factors that led to the United States' Louisiana Purchase in 1803.

The Ohio's composed the libretto for the opera Margaret Garner, based on the life and trial of an enslaved woman who escaped with her family across the river.

The Ohio again ranked as the most polluted in 2013, and has been the most polluted river since at least 2001, according to the Ohio River Valley Water Sanitation Commission .

Several decades beginning in the 1950s, the Ohio River was polluted with hundreds of thousands of pounds of PFOA, a fluoride-based chemical used in making teflon, among other things, by the DuPont chemical company from an outflow pipe at its Parkersburg, West Virginia, facility.

The Ohio River is formed by the confluence of the Allegheny and Monongahela rivers at what is Point State Park in Pittsburgh, Pennsylvania.

Where the Ohio joins the Mississippi is the lowest elevation in the state of Illinois, at 315 feet .

The Ohio River is a left and the largest tributary by volume of the Mississippi River in the United States.

At the confluence, the Ohio is considerably bigger than the Mississippi, measured by long-term mean discharge.

The Ohio River is a naturally shallow river that was artificially deepened by a series of dams.

The Ohio River is a climatic transition area, as its water runs along the periphery of the humid continental and humid subtropical climate areas.

Upper The Ohio River formed when one of the glacial lakes overflowed into a south-flowing tributary of the Teays River.

Middle The Ohio River formed in a manner similar to that of the upper The Ohio River.

Along the banks of the Ohio are some of the largest cities in their respective states: Pittsburgh, the third largest city on the river and second-largest city in Pennsylvania; Cincinnati, the third-largest city in Ohio; Louisville, the largest city on the river and in Kentucky; Evansville, the third-largest city in Indiana; Owensboro, the fourth-largest city in Kentucky; and three of the five largest cities in West Virginia—Huntington, Parkersburg, and Wheeling .

Forts along the Ohio river include Fort Pitt, Fort McIntosh, Fort Randolph, Fort Henry, Fort Harmar, Fort Washington, and Fort Nelson .

The Ohio River seen at Sciotoville, from the "Geography of The Ohio, " 1923.