Ten Mile is an unincorporated area in northern Meigs and southeastern Roane counties in the U.S. state of Tennessee. The Roane County portion is included in the "Harriman, Tennessee Micropolitan Statistical Area". Ten Mile is primarily a summer cottage community on Watts Bar Lake. It consists of summer cottages, small locally owned stores and restaurants, a bank, marinas, resorts, and a Post Office. The nearby TVA Watts Bar nuclear plant, and Watts Bar Dam spanning the Tennessee River across the Meigs County and Rhea County lines have played, and continue to play, an important role in the local economy.