Lock operator Brandon Smith communicates with the Motor Vessel Mississippi captain as the towboat prepares to lock through Guntersville Lock in Grant, Ala., the morning of Aug. 9, 2015. The lock, which is located at Tennessee River Mile 349, is maintained and operated by the U.S. Army Corps of Engineers Nashville District. The vessel is transporting the Mississippi River Commission, which is conducting a low water inspection of the Tennessee River. (USACE photo by Leon Roberts)