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 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 C…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 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.
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