Coordinates: 43°15′31″N 77°36′10″W / 43.25861°N 77.60278°W / 43.25861; -77.60278

Genesee River
none Upper Genesee near Belmont
Upper Genesee near Belmont
Country USA
States New York, Pennsylvania
Counties Monroe, NY, Livingston, NY, Wyoming, NY, Allegany, NY, Potter, PA
Major cities Rochester, NY, Wellsville, NY, Genesee, PA, Geneseo, NY
Length 157 mi
Watershed 2,500 sq mi 
Discharge at Rochester
 - average 4,430 cu ft/s
Discharge elsewhere
 - Portageville, NY 2,720 cu ft/s
 - location Ulysses Township, Potter County, Pennsylvania, USA
 - coordinates 41°54′12″N 77°43′58″W / 41.90333°N 77.73278°W / 41.90333; -77.73278
 - elevation 2,240 ft
Mouth Lake Ontario
 - location Rochester, Monroe County, New York, USA
 - coordinates 43°15′31″N 77°36′10″W / 43.25861°N 77.60278°W / 43.25861; -77.60278
 - elevation 256 ft
Major tributaries
 - left Oatka Creek
 - right Canaseraga Creek
Map of Genesee River
Map of Genesee River

The Genesee River's name is derived from the Seneca tribe word meaning a beautiful open valley, good valley or pleasant valley. It flows northward through western New York from its source south of the town of Genesee in Pennsylvania, near Wellsville , New York and empties into Lake Ontario north of the City of Rochester, New York. The river drains about 2500 square miles . Falls along the river are within the gorge of Letchworth State Park near Portageville, New York and within Rochester, where they provided power to 19th century industry. A dam at Mount Morris is the largest flood control dam east of the Mississippi. It has greatly reduced flood damage in the lower Genesee Valley; its capacity has never been exceeded. The dam was completed in 1952.

The river was the original source of power and commerce in the Rochester area. Many grist mills along the river grind more flour than anywhere else in North America, giving Rochester her nickname "Flour City".

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