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Lake DeForest

Lake DeForest
Lake DeForest High Tor.jpg
Lake DeForest viewed from nearby High Tor, a summit of the northern Hudson River Palisades.
Location Clarkstown, New York,
United States
Coordinates 41°09′21″N 73°57′30″W / 41.1558°N 73.9584°W / 41.1558; -73.9584 (Lake Deforest)Coordinates: 41°09′21″N 73°57′30″W / 41.1558°N 73.9584°W / 41.1558; -73.9584 (Lake Deforest)
Type Reservoir
Primary inflows Hackensack River
Basin countries Newark Basin
United States

Lake DeForest, also called DeForest Lake, is a reservoir in Clarkstown, New York, created in 1956 by impounding the Hackensack River, which is a principal part of the water supply for Rockland County, New York and Northern New Jersey, mainly Bergen and Hudson counties. The reservoir is owned and operated by Suez North America, and is the most upstream of its reservoirs along the river's watershed, the others being Lake Tappan, the Woodcliff Lake Reservoir, and the Oradell Reservoir. It has a storage capacity of 5.6 billion gallons. Swimming and bathing are disallowed because the water is reserved for potable use. The lake is traversed by a causeway carrying Congers Road (CR 80).

The lake was developed by an interstate partnership of the Hackensack Water Company (of New Jersey) and the Spring Valley Water Company (of Spring Valley, New York), to provide water on both sides of the state line.

Adrian Leiby's monograph, The Hackensack Water Company, 1869-1969, describes the conception of the lake (owing chiefly to George F. Wieghardt, chief engineer from 1938 to 1954); the sense that the proposed lake needed to be built soon, before any ill-advised new housing developments on the swampy lowlands would preclude it; and the difficulty in refuting conspiracy theories among the public that the proposed lake was a plan by New Jersey thieves to steal water from New York state or to create miles of "smelly mud flats" in Clarkstown. By the time of a severe drought in 1963-65, Leiby noted, public approval of the attractive lake and the water security it provided was nearly universal; writing in 1969, he said, "Twelve years later it is hard to believe that there is a single person in the County who would willingly see DeForest Lake drained and its land filled with development houses."


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