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Allegheny River
The Allegheny River at Pittsburgh, Pennsylvania
Origin	Raymond, PA
Mouth	Ohio River
Basin countries	USA
Length	325 miles (523 km)
Source elevation	~2,490 feet (759 m)
Avg. discharge	16,700 cubic feet/s (1,503 m³/s) at Natrona
Basin area	11,580 square miles (29,992 km²)

Allegheny River watershed

Much of the area through which the Allegheny River flows consists of hilly woodlands.

Lock and Dam No. 2 on the Allegheny River in Aspinwall, Pennsylvania. The Highland Park Bridge crosses the river just above the dam.

The Allegheny (left) and Monongahela (right) join to form the Ohio River at Pittsburgh, Pennsylvania.

The Allegheny River (also spelled Allegany River, especially in New York state^{[citation needed]}) 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."^[1]

The Allegheny rises in north central Pennsylvania, in central Potter County, approximately 10 mi (16 km) south of the New York border. It flows west past Coudersport then turns north into western New York State, looping westward across southern Cattaraugus County for approximately 30 mi (48 km), past St. Bonaventure University and Salamanca and forming the northern boundary of Allegany State Park before re-entering northwestern Pennsylvania approximately 20 mi (32 km) southeast of Jamestown, New York.

It flows in a broad zigzag course generally southward across western Pennsylvania, first flowing southwest past Warren, 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. It enters the Pittsburgh suburbs and the City of Pittsburgh from the northeast passing Karns & Natrona in Harrison Township, Braeburn, Lower Burrell, Brackenridge, Tarentum, Creighton, Arnold, New Kensington, Springdale, Harmarville, Blawnox, Fox Chapel, Sharpsburg, Etna, Millvale, Lawreneville, Highland Park, The North Side, Downtown Pittsburgh, Point State Park and joins with the Monongahela River at "The Point" in Downtown Pittsburgh, Pennsylvania to form the Ohio River, which flows via the Mississippi River into the Gulf of Mexico.

In its upper reaches the Allegheny is joined from the south by Potato Creek in McKean County, Pennsylvania and from the north by Olean Creek at Olean, New York. The Great Valley Creek and Little Valley Creek join the river from the north in Salamanca, New York before becoming the Allegheny Reservoir. After re-entering Pennsylvania, it is joined from the east by Kinzua Creek 10 mi (16 km) upstream of Warren; from the north by Conewango Creek at Warren; from the west by Brokenstraw Creek; from the north by Oil Creek at Oil City; from the west by French Creek at Franklin; from the east by the Clarion River, one of its principal tributaries, in eastern Clarion County; from the east by Crooked Creek southeast of Kittanning; and from the east by the Kiskiminetas River, another principal tributary, at Freeport. Buffalo Creek enters at Freeport, Bull Creek enters at Tarentum. There are many other creeks, runs and streams that enter or join with the Allegheny River.

In the 16th century, control of the river valley passed back-and-forth between Algonquian-speaking Shawnee and the Iroquois. By the time of the arrival of the French in the early 18th century, the Shawnee were once again in control and formed an alliance with the French against the incursion of British settlement across the Allegheny Mountains. The conflict over the expansion of British settlement into the Allegheny Valley and the surrounding Ohio Country was a primary cause of the French and Indian War in the 1750s. During the war, the village of Kittaning, the principal Shawnee settlement on the river, was completely destroyed by British reprisal raids from central Pennsylvania.

Nevertheless, the British, after gaining control of the area in the 1763 Treaty of Paris, kept the area closed to white settlement, in part to repair and maintain relations with the Native Americans. The pressure to open the river valley and the surrounding area to settlement is considered by historians to be one of the root causes of the American Revolutionary War in the following decade.

During the 19th century, the river became a principal means of navigation in the upper Ohio valley, especially for the transport of coal. Although the building of the railroads lessened the importance of the river somewhat, the lower river (navigable as far as East Brady, Pennsylvania through locks) has continued to serve as route of commercial transportation until the present day. In 1875, the first U.S. petroleum was drilled north of the river at Titusville.

In 1965, the completion of the federally-sponsored Kinzua Dam for flood-control in northwestern Pennsylvania east of Warren created the long Allegheny Reservoir, part of which is included in the Allegheny National Recreation Area. The dam flooded parts of lands deeded "forever" to the Seneca tribe and to Cornplanter and his descendants. (The event is described in the Johnny Cash tune "As Long as the Grass Shall Grow.")

• Allegany
• Carrollton
• Olean
• Portville
• St. Bonaventure
• Salamanca
• Weston Mills

• Applewold
• Arnold
• Aspinwall
• Blawnox
• Brackenridge
• Cadogan
• Cheswick
• Coudersport
• East Brady
• Eldred
• Emlenton
• Etna
• Ford City
• Foxburg
• Franklin
• Freeport
• Kittanning
• Lower Burrell
• Manorville
• Millvale
• New Kensington
• Oakmont
• Oil City
• O'Hara Township
• Parker
• Penn Hills
• Pittsburgh
• Plum
• Port Allegany
• Schenley
• Sharpsburg
• Springdale
• Tarentum
• Templeton
• Tidioute
• Tionesta
• Verona
• Warren
• West Kittanning
• Youngsville

• List of crossings of the Allegheny River
• List of New York rivers
• List of Pennsylvania rivers

1. ^ Stewart, George R. (1967, pg. 8) Names on the Land. Boston: Houghton Mifflin Company.

• USGS GNIS: Allegheny River

• U.S. Geological Survey: PA stream gaging stations
• Photographs of the Allegheny River watershed
• Mouth or other endpoint (Pittsburgh) is at coordinates 40°24′43″N 80°00′51″W / 40.4118, -80.0141
• Source (Unnamed pond near Raymond, Pennsylvania) is at coordinates 41°51′24″N 77°52′30″W / 41.8567, -77.8751