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The 'Cannonsville Reservoir' is a reservoir in Delaware County, New York, that was formed by impounding over half of the West Branch of the Delaware River. It is the westernmost of New York City's reservoirs, being at the western portion of the Delaware Watershed. Placed in service in 1964, it is the most recently constructed New York City-owned reservoir. The town of Cannonsville was destroyed to make room for the reservoir.
It has the largest drainage basin of all of the NYC reservoirs, being at 455 square miles (728 km²). The reservoir's capacity is 95.7 billion gallons (36.2 million m³). This water flows over halfway through the reservoir to enter the 44-mile (70.4-km) West Delaware Tunnel in Tompkins, New York. Then it flows through the aqueduct into the Rondout Reservoir, where the water enters the 85-mile (136-kilometre) Delaware Aqueduct.
The Delaware Aqueduct then continues through the West Branch Reservoir and the Kensico Reservoir in Westchester and Putnam counties north of the city. The aqueduct continues further south through the Hillview Reservoir in Yonkers, and then continues through The Bronx, Queens, and Brooklyn, eventually ending in Staten Island, providing New York City with about 50% of their drinking water.

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See also

★ List of reservoirs and dams in New York