Fontana Dam, the largest dam of the Tennessee Valley Authority (TVA) system, is located on the Little Tennessee River in Graham County. Completed in 1945, it is a gravity-type concrete structure 480 feet high, 2,365 feet long, and 376 feet thick at its base. The six-story powerhouse of reinforced concrete with glass walls is located at the base of the dam. Typical of TVA engineering, Fontana is multipurpose, providing electric power, flood control, navigation, and recreation.