Capacity
Nickajack Dam is 81 feet (25 m) high and 3,767 feet (1,148 m) long. Its reservoir has 179 miles (288 km) of shoreline and 10,370 acres (4,200 ha) of water surface. The dam's 10 spillway bays have a combined discharge of 360,000 cubic feet per second (10,000 m3/s). The electrical generating capacity of Nickajack is 104 megawatts.
Nickajack is serviced by a 600-by-110-foot (183 by 34 m) auxiliary lock that can lift or lower as many as nine large barges at a time 41 feet (12 m) between Guntersville Lake and Nickajack Lake. The dam's original design allowed for a 800-by-110-foot (244 by 34 m) main lock beside the auxiliary, but it was never completed. This lock, as well as every lock on the Tennessee river, is operated and maintained by the U.S. Army Corps of Engineers.
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