CHARLOTTE, Tenn. (May 10, 2013) – The U.S. Army Corps of Engineers Nashville District is offering the public free guided tours of Cheatham Lake’s Powerhouse. Approximately 45 minutes in length, tours are scheduled for May 25, June 22, July 13, Aug. 17, and Sept. 7. The tour start times are 9 a.m. and 11 a.m.