Allegheny River Basin
The Allegheny River Basin is a primary tributary of the Ohio River along with the Monongahela River. The two converge in downtown Pittsburgh to form the Ohio River. The Allegheny River itself is 325 miles long has a drainage area of 11,600 square miles.
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Monongahela River Basin
The Monongahela River originates in north-central West Virginia and flows north through south-western Pennsylvania to Pittsburgh where it meets the Allegheny River to form the Ohio River. It is 128 miles long with a drainage basin of 7,340 square miles.
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Ohio River Basin
The Ohio River is formed by the confluence of the Allegheny and Monongahela River in downtown Pittsburgh, PA. The river is 981 miles long and flows to the Mississippi River at Cairo, IL. For the 3RQ program, our focus is on the Upper Ohio River Basin.
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