The Allegheny River (also spelled Allegany River, especially in
New York state) is a principal
tributary of the
Ohio River and is located in the eastern
United States. It forms the Ohio with the
Monongahela River at downtown
Pittsburgh's "The Point" at
Point State Park. The river is approximately 325 mi (523 km) long, running through the
U.S. states of
New York and
Pennsylvania. It drains a rural
dissected plateau of 11,580 sq mi (29,992 km²) in the northern
Allegheny Plateau, providing the northeastern most drainage in the watershed of the
Mississippi River. Its tributaries reach to within 8 mi (13 km) of
Lake Erie in southwestern New York. The valley of the river has been one of the most productive areas of energy extraction in U.S. history, with extensive deposits of
coal,
petroleum, and
natural gas. The word "Allegheny" comes from the
Lenape (Delaware) Indians. Although it is usually translated as "fine river", the meaning is not definitively known. There is a Lenape legend of a tribe called "Allegewi" who used to live along the river. Other Indians, such as the
Iroquois, considered the Allegheny and Ohio rivers as the same, as is suggested by a New York State road sign on
Interstate 86 that refers to the Allegheny river secondarily as "O Hi Yo."
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