Claytor Lake State Park is a 472-acre (191 ha) state park in Pulaski County, Virginia, in the United States. The park is located on Claytor Lake, a 4,500-acre (18 km2), 21-mile-long (34 km) reservoir on the New River formed by Claytor Dam, which is used to generate hydroelectric power by the Appalachian Power Company. The reservoir is named for William Graham Claytor (1886–1971) of nearby Roanoke, a former vice president of Appalachian Power who supervised construction of the dam and creation of the lake.