Cheat Lake is a 13 mi reservoir on the Cheat River in Monongalia County, West Virginia, United States. It was originally named Lake Lynn, but the Board on Geographic Names officially decided upon Cheat Lake as the reservoir's name in 1976. Cheat Lake is located immediately downstream of the 10 mi Cheat Canyon. Cheat Lake has 3 marinas located towards the river end of the reservoir. They are Edgewater Marina, Cheat Lake Marina, and Sunset Beach Marina. Cheat Lake Dam is located directly south of the Mason–Dixon line border with Pennsylvania. The dam is run by eleven employees and has a generating capacity of 52 MW. Cheat Lake Dam's total length across the Cheat River is approximately 1,000 ft. The first water flowed over the dam on December 23, 1925 and it began its operation on May 31, 1926.