sentences:  After improvements by TVA in 1949, the dam had a generating capacity of 99,700 kilowatts.The dam's lock, which went into operation on November 1, 1913, was by , and its lift was the highest in the world at that time.Along with Muscle Shoals and the Elk River Shoals further downstream, the Tennessee River Gorge had long been one of the major impediments to river navigation in the upper Tennessee Valley.