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| Cannonsville Reservoir | |
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Cannonsville Reservoir from Sands Creek Road in Hancock.
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  Cannonsville Reservoir Location within New York Show map of New York Adirondack Park Cannonsville Reservoir Cannonsville Reservoir (the United States) Show map of the United States | |
| Location | Delaware County, New York |
| Coordinates | 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] |
| Type | Reservoir |
| 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)[1] |
The Cannonsville Reservoir is a reservoir in the New York City water supply systeminDelaware 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.
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 ReservoirinPutnam County, New York, then the Kensico ReservoirinWestchester 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]
No motor boats are allowed on the reservoir; non-motorized boats that have been steam-cleaned and that have required tags may be used in the reservoir during the summer.[4]
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| Croton reservoirs |
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| Catskill & Delaware reservoirs |
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| Controlled lakes |
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| Waterways |
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| Aqueducts |
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| Storage reservoirs |
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| Distribution tunnels |
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| Treatment plants |
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Italics indicate a decommissioned site | |
