Chickamauga Lake is a reservoir in the United States along the Tennessee River created when the Chickamauga Dam, as part of the Tennessee Valley Authority, was completed in 1940. The lake stretches from Watts Bar Dam at mile 529.9 to Chickamauga Dam at mile 471.0 making the lake 58.9 miles long. It borders Rhea County, Meigs Cou…Chickamauga Lake is a reservoir in the United States along the Tennessee River created when the Chickamauga Dam, as part of the Tennessee Valley Authority, was completed in 1940. The lake stretches from Watts Bar Dam at mile 529.9 to Chickamauga Dam at mile 471.0 making the lake 58.9 miles long. It borders Rhea County, Meigs County, and Hamilton County with 810 miles of shoreline and two bridges crossing it at State Highway 60 and Highway 30. The lake is commonly used for recreational and outdoor activities, especially at the southern end, due to the high population density surrounding it. It was named after the Chickamauga Cherokee who used to live in the area.