New York State Department of Environmental Conservation. "Middle Branch Reservoir"(PDF). Retrieved 2008-04-08.
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Note that this is not identical with the New York City water supply system's "Croton Watershed". Numerous small natural lakes and ponds, as well as large Lake Mahopac, are part of the Croton River's watershed but not part of New York City’s supply system. A map of the actual Croton Watershed is found here.