Normandy Dam is a dam built by the Tennessee Valley Authority on the Duck River in the U.S. state of Tennessee. It straddles the border between Bedford and Coffee counties. Completed in 1976, the dam was built primarily for flood control and economic development purposes, and does not produce any electricity. The town of Normandy is located just sou…Normandy Dam is a dam built by the Tennessee Valley Authority on the Duck River in the U.S. state of Tennessee. It straddles the border between Bedford and Coffee counties. Completed in 1976, the dam was built primarily for flood control and economic development purposes, and does not produce any electricity. The town of Normandy is located just southwest of the dam. The water level in Normandy Reservoir varies about 11 feet in a normal year.