 In 1842 the Croton River, a tributary of the Hudson River, was impounded by the Old Croton Dam to create Croton Lake.New York City's first source of water beyond its city limits, its waters traveled by aqueduct to the Croton Distributing Reservoir in midtown Manhattan.In 1905 the New Croton Dam was completed, expanding the existing impoundment into the New Croton Reservoir, then the largest in the Croton Watershed, and thus one of the largest in the New York City water supply system to that point.