Schoharie Creek is a river in New York that flows north from the foot of Indian Head Mountain in the Catskills through the Schoharie Valley to the Mohawk River. It is twice impounded north of Prattsville to create New York City's Schoharie Reservoir and the Blenheim-Gilboa Power Project. During the American Revolutionary War, Iroquois Indian attacks against the cluster of farms in the valley of the Cobleskill Creek tributary was the site of the Cobleskill Massacre (May 1778), virtually depopulating settlements in the southern Mohawk valley. News of this and two other mixed Tory-Indian guerrilla attacks led to an appropriation of funds for the Sullivan Expedition dispatched by General Washington in 1779 to break the threat of Indian raids. The Erie Canal crossed over the creek by an aqueduct at Schoharie Crossing State Historic Site. Two notable bridge collapses have occurred on Schoharie Creek. In 1987, two spans of the New York State Thruway collapsed. On August 28, 2011, the covered Old Blenheim Bridge collapsed due to flooding from Hurricane Irene. Geography Watershed and tributary streams Schoharie Creek is part of the drainage system of the Hudson River watershed and a direct tributary of the Mohawk River. Tributaries of Schoharie Creek, listed from upstream to downstream, include: East side Gooseberry Creek Red Kill East Kill John Chase Brook Batavia Kill Hunterfield Creek Platter Kill Keyser Kill Little Schoharie Creek Stony Brook Fox Creek Bowman Creek West side Roaring Kill Cook Brook West Kill Little West Kill Johnson Hollow Brook Bear Kill Mine Kill West Kill Cole Brook Panther Creek Pleasant Valley Creek Line Creek Cobleskill Creek Cripplebush Creek Fly Creek Wilsey Creek Irish Creek Watershed Before European colonization, the watershed was mostly forested with a few small areas cleared by Native Americans for hunting. Early European settlers attempted to farm the land, but soon abandoned it due to the short growing seasons, steep slopes and rocky soil. Between 1800 and the early 1900s, mills, the tanning industry, quarrying for bluestone, logging, railroads, and resorts cleared the Catskills of most of its forest cover. Starting in the early 1900s, these industries began to decline and areas that were previously cleared have grown back into forest. As of 2001, approximately 85% of the Schoharie Creek's watershed has been classified as forested. Hydrology Water quality New York's Department of Environmental Conservation (DEC) rates the water quality of Schoharie Creek in different sections. The