- The Ohio River is 981 miles (1582 km) long, starting at the confluence of the Allegheny and the Monongahela Rivers in Pittsburgh, Pennsylvania, and ending in Cairo, Illinois, where it flows into the Mississippi River.
- The Ohio River flows through or borders six states: Illinois, Indiana, Kentucky, Ohio, Pennsylvania, and West Virginia.
- The Ohio River is a source of drinking water for more than three million people.
- More than 25 million people, almost 10 percent of the U.S. population, live in the Ohio River Basin. For a breakdown on Ohio River Basin Population, click here: Basin Popution Within Compact States
- Approximately 150 species of fish have been collected from the Ohio River.
- The average depth of the Ohio River is approximately 24 feet.
- The widest point along the Ohio River is approximately 1 mile at the Smithland Dam.
- Nonpoint source pollution from urban runoff, agricultural activities, and abandoned mines is a major cause of water pollution in the Ohio River.
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