Cannonsville Reservoir

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,[2] which impounded 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.

Cannonsville Reservoir
Cannonsville Res. Sands Creek Rd. Hancock, NY.JPG
Cannonsville Reservoir at Hancock New York
Cannonsville Reservoir is located in New York Adirondack Park
Cannonsville Reservoir
Cannonsville Reservoir
Location within New York
Cannonsville Reservoir is located in the United States
Cannonsville Reservoir
Cannonsville Reservoir
Cannonsville Reservoir (the United States)
LocationDelaware County, New York
Coordinates42°06′41″N 75°16′21″W / 42.1113705°N 75.2726253°W / 42.1113705; -75.2726253Coordinates: 42°06′41″N 75°16′21″W / 42.1113705°N 75.2726253°W / 42.1113705; -75.2726253, 42°07′50″N 75°17′50″W / 42.1306851°N 75.2973520°W / 42.1306851; -75.2973520, 42°04′59″N 75°12′30″W / 42.0829358°N 75.2083924°W / 42.0829358; -75.2083924, 42°04′05″N 75°22′35″W / 42.0680088°N 75.3763070°W / 42.0680088; -75.3763070[1]
Primary inflowsWest Branch Delaware River
Primary outflowsWest Branch Delaware River,
West Delaware Tunnel
Catchment area455 sq mi (1,180 km2)
Basin countriesUnited States
Water volume362,000,000 m3 (0.087 cu mi)
Surface elevation1,148 feet (350 m)[1]

The town of Cannonsvile was destroyed to make room for the reservoir, which lies within the towns of Tompkins and Deposit.

Its 455 square miles (1,180 km2) drainage basin is the largest of all of the NYC reservoirs. Capacity is 95.7 billion US gallons (362,000,000 m3). Water from the reservoir flows through the 44-mile (71 km) West Delaware Tunnel 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.[3]


See alsoEdit


  1. ^ a b "Cannonsville Reservoir". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-09-23.
  2. ^ "Cannonsville Dam". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2018-09-23.

External linksEdit