Apple Canyon Lake, reservoir (1 sq mi/2.6 sq km), Jo Daviess co., NW Ill., on Hells Branch Creek, 27 mi/43 km ESE of Dubuque (Iowa); 42°25'N 90°10'W. Max. capacity 14,630 acre-ft. Formed by Apple Canyon L. Dam (78ft/24 m high), built (1978) for recreation.