Cannonsville Reservoir at Hancock New York
|Location||Delaware County, New York|
|Coordinates||Coordinates: , , , |
|Primary inflows||West Branch Delaware River|
|Primary outflows||West Branch Delaware River, |
West Delaware Tunnel
|Catchment area||455 sq mi (1,180 km2)|
|Basin countries||United States|
|Water volume||362,000,000 m3 (0.087 cu mi)|
|Surface elevation||1,148 feet (350 m)|
The Cannonsville Reservoir is a reservoir in the New York City water supply system in Delaware County, New York. It was formed by construction of the Cannonsville Dam on its west end, which empounded over half of the West Branch of the Delaware River. Lying on the western part of the Delaware Watershed, it is the westernmost of New York City's reservoirs. It was placed in service in 1964, and is the most recently constructed New York City-owned reservoir.
Its 455 square mile drainage basins is the largest of all of the NYC reservoirs.(1178 km2) Capacity is 95.7 billion US gallons (362,000,000 m3). Water from the reservoir flows into the 44-mile (71 km) West Delaware Tunnel in Tompkins, New York. Then it flows through the aqueduct[which?] into the Rondout Reservoir, before joining the 85-mile (137 km) Delaware Aqueduct, which provides New York City with about 50% of its drinking water.
The Delaware Aqueduct then crosses beneath the Hudson River and continues on to the West Branch Reservoir in Putnam County, New York, then the Kensico Reservoir in Westchester County, both north of the City. It then continues further south to the Hillview Reservoir in Yonkers, where it joins the flows of the Catskill and New Croton aqueducts for distribution through the New York City tunnel system.
The Cannonsville Dam is being considered as a site for a 14.08MW hydroelectric generating station.
- Johnny Brook
- Dry Brook
- Sherruck Brook
- Trout Creek
- Loomis Brook
- Chamberlain Brook
- Dryden Brook
- Maxwell Brook
- Fish Brook
- "Cannonsville Reservoir". Geographic Names Information System. United States Geological Survey. Retrieved 2018-09-23.
- "Cannonsville Dam". Geographic Names Information System. United States Geological Survey. Retrieved 2018-09-23.
- "BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION APPLICATION FOR LICENSE FOR MAJOR PROJECT – EXISTING DAM" (PDF). www.nyc.gov.
- Final Environmental Assessment for Hydropower License