Located in Washington County, Canonsburg Lake is a 76-acre impoundment owned by the Commonwealth of Pennsylvania and managed by the Fish and Boat Commission. The lake is formed by a concrete gravity dam impounding Little Chartiers Creek, adjacent to Donaldsons Crossroads. The dam is about 525 feet long and 45 feet high. It impounds a lake with a surface area of about 76 acres with a maximum depth at normal pool of 18 feet (estimated). The drainage area for the lake is comprised of 46 square miles.
The Commonwealth of Pennsylvania, acting by and through the Pennsylvania Fish and Boat Commission, owns and controls about 138 acres at this site, which includes the 76 acre lake, dam, shoreline and associated lands. The Commonwealth acquired this property in 1957. The dam, known locally as the Alcoa Dam, was built in 1943.