Capacity
Guntersville Dam is 94 feet (29 m) high and 3,979 feet (1,213 m) wide, and has a generating capacity of 140,400 kilowatts of electricity. The dam's 18-bay spillway has a total discharge capacity of 478,000 cubic feet per second (13,500 m3/s). Its reservoir has a storage capacity of 1,049,000 acre·ft (1,294,000 dam³),, with 162,000 acre·ft (200,000 dam³) reserved for flood control. The reservoir is the most stable reservoir in the TVA system, fluctuating just 2 feet (0.61 m) per year.
Guntersville Dam is serviced by a 110-by-600-foot (34 by 180 m) navigation lock. The lock can lift and lower vessels up to 45 feet (14 m) between Guntersville Lake and Wheeler Lake. The dam's original 60-by-360-foot (18 by 110 m) lock is now used as an auxiliary lock.
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