OLD HICKORY, Tenn. (June 4, 2013) – The U.S. Army Corps of Engineers Nashville District at Old Hickory Lake is now accepting registration applications for the Saturday, June 29 open house tours beginning at 9 a.m. and 11 a.m. at Old Hickory Lock and Dam. Free to the public and approximately 60 minutes in length, the guided tours will allow guests to have an up close view of Old Hickory Lake’s Navigation Lock and Powerhouse facilities.