Old Hickory Dam is offering free public tours of the powerhouse 10:30 a.m. Saturday, June 25, and 10:30 a.m. Saturday, Aug. 13. Tour participants must register for the tours at least a week and a half (eight business days) prior to the desired tour date. To request a registration form via e-mail please call the Old Hickory Lake Resource Manager’s Office at 615-822-4846 or 615-847-2395.