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The Allegheny River is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny River joins with the Monongahela River to form the Ohio River at the "Point" of Point State Park in Downtown Pittsburgh, Pennsylvania.
The river is approximately 325 miles (523 km) long, running through the U.S. states of New York and Pennsylvania. It drains a rural dissected plateau of 11,580 square miles (30,000 km2) in the northern Allegheny Plateau, providing the northeastern most drainage in the watershed of the Mississippi River. Its tributaries reach to within 8 miles (13 km) of Lake Erie in southwestern New York.
The Allegheny River rises in north central Pennsylvania, on Cobb Hill in central Potter County, approximately 10 miles (16 km) south of the New York border. It flows west past Coudersport then turns north into western New York, looping westward across southern Cattaraugus County for approximately 30 miles (48 km), past Portville, Olean, St. Bonaventure University and Salamanca and flowing through Seneca Indian Nation lands close to the northern boundary of Allegany State Park before re-entering northwestern Pennsylvania approximately 20 miles (32 km) southeast of Jamestown, New York.
It flows in a broad zigzag course generally southward across Western Pennsylvania; first flowing southwest past Warren, Tidioute, Tionesta, Oil City, and Franklin, forming much of the northwestern boundary of Allegheny National Forest. South of Franklin it turns southeast across Clarion County in a meandering course, then turns again southwest across Armstrong County, flowing past Kittanning, Ford City, Clinton, and Freeport.
The Highland Park Bridge crosses the Allegheny River at Aspinwall, Pennsylvania, just above Allegheny River Lock and Dam Two.The river enters both Allegheny and Westmoreland counties, the Pittsburgh suburbs, and the City of Pittsburgh from the northeast. It passes Sligo, Karns, and Natrona in Harrison Township; Metcalf, Braeburn, Lower Burrell, and New Kensington; Brackenridge, Tarentum, Creighton, Clyde, Springdale, Harmarville, Blawnox, Fox Chapel, Sharpsburg, Etna, Millvale, Lawrenceville, Highland Park, the North Side, Downtown Pittsburgh, and Point State Park. The Allegheny joins with the Monongahela River at "The Point" in Downtown Pittsburgh, Pennsylvania to form the Ohio River.
Water from the Allegheny River eventually flows into the Gulf of Mexico via the Ohio and Mississippi rivers.