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  1. The Allegheny River ( / ˌælɪˈɡeɪni / AL-ig-AY-nee) is a 325-mile-long (523 km) headwater stream of the Ohio River that is located in western Pennsylvania and New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, northwesterly into New York, then in a zigzag southwesterly across ...

  2. Mar 22, 2023 · The Allegheny River is not just crucial because it contributes up to 60% of the Ohio River water flow but also because it is home to the most populous freshwater mussel habitat on the planet. Mussels are bivalved mollusks that live in freshwater. They play a critical role, mainly due to their reputation as among the finest water filters.

  3. 2 days ago · The river enters New York state where the Allegheny Reservoir is impounded at Allegany State Park. Turning southwest, it continues for 120 miles (190 km), meandering to the southeast and again southwest and eventually joining the Monongahela River at Pittsburgh to form the Ohio River. In its total length (321 miles [516 km]), it drains an area ...

    • The Editors of Encyclopaedia Britannica
  4. The Allegheny River is a 325-mile-long (523 km) headwater stream of the Ohio River that is located in western Pennsylvania and New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, northwesterly into New York, then in a zigzag southwesterly across the border and through Western Pennsylvania to join the Monongahela River at the Forks ...

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  6. The Allegheny River Basin occupies 11,747 square miles in the states of New York and Pennsylvania. The Allegheny River is over 315 miles long and contributes 60 percent of the Ohio River flow at Pittsburgh, Pennsylvania.

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