Ten Mile is an unincorporated community in northern Meigs and southeastern Roane counties in the U.S. state of Tennessee. Ten Mile is primarily a summer cottage community on Watts Bar Lake. It includes summer cottages, small locally owned stores and restaurants, a bank, marinas, resorts, churches, and a post office. The nearby TVA Watts …Ten Mile is an unincorporated community in northern Meigs and southeastern Roane counties in the U.S. state of Tennessee. Ten Mile is primarily a summer cottage community on Watts Bar Lake. It includes summer cottages, small locally owned stores and restaurants, a bank, marinas, resorts, churches, 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.