Lake Washington Lake Washington Show map of New York Lake Washington Show map of the United States Location Orange County, New York, United States Coordinates 41°29′28″N 74°04′05″W﻿ / ﻿41.491°N 74.068°W﻿ / 41.491; -74.068Coordinates: 41°29′28″N 74°04′05″W﻿ / ﻿41.491°N 74.068°W﻿ / 41.491; -74.068 Type reservoir Primary inflows Silver Stream Basin countries United States Water volume 1.5 billion US gallons (5,700,000 m3) Surface elevation 301 feet (92 m)