Appalachian Power Company constructed Smith Mountain and Leesville Dams between 1960 and 1963 to generate hydroelectric energy. The waters of the Roanoke and Blackwater Rivers formed Smith Mountain Lake, one of two resulting reservoirs, which reached full pond at 795 feet above sea level on 7 March 1966. This 40-mile-long lake, the largest wholly within Virginia, covered 20,600 acres that had primarily been farmland. With its scenic coves and 500 miles of shoreline, the lake became a recreational destination and gave rise to a thriving lakeside community. Smith Mountain Lake State Park was established on 15 July 1983.