Rushford Lake is a 585 acre man-made reservoir located in northwest Allegany County. The lake was built by Rochester Gas and Electric in the late 1920s for hydropower and then sold in 1981 to the Rushford Lake Recreational District, a governmental body created in 1981. The lake is drawn down about 40 feet each winter, which is why the shorelines are shown in the LiDAR hillshade.