Fort Supply Lake, reservoir, 4 mi/6.4 km long, Woodward co., NW Okla., on Wolf Creek 5 mi/8 km SW of its mouth on North Canadian (Beaver) R., 10 mi/16 km NW of Woodward and just S of Fort Supply; 36°32'N 99°33'W. Formed by Fort Supply Dam (82 ft/25 m high, 11,325 ft/3,452 m long), built (1942) for flood control and water supply.