Ohio River depth map (nautical chart)The marine chart shows water depth and hydrology on an interactive map. The source of the Ohio River is the Allegheny River near Allegany Township and the Monongahela River near Fairmont. The mouth of is the Mississippi River at Cairo, Illinois. Average discharge: 281,000 cu ft/s (8,000 m3/s)(1951–80).
Ohio, West Virginia, Indiana, Illinois, Pennsylvania, Kentucky
981 mi (1,579 km)
189,422 sq mi (490,600 km2)
Pittsburgh, Wheeling, Huntington, Ashland, Cincinnati, Louisville, Owensboro, Evansville