Capacity
South Holston Dam is an earth-and-rock dam 285 feet (87 m) high and 1,600 feet (490 m) long, and has a generating capacity of 38,500 kilowatts. The dam's fixed-crest morning glory spillway has a maximum discharge of 116,200 cubic feet per second (3,290 m3/s). South Holston Lake extends northeastward for 24 miles (39 km) into southwestern Virginia, with 168 miles (270 km) of shoreline and a storage capacity of 765,000 acre·ft (944,000 dam3), of which 252,757 acre·ft (311,771 dam3) is reserved for flood control. The reservoir's operating levels vary by about 23 feet (7.0 m) in a typical year.
The dam has two intakes, one at the north end and one at the south end. The north intake transfers water from the reservoir via high-pressure conduit to the powerhouse at the northern base of the dam. The south intake feeds water into the dam's spillway, from which it travels through a sluiceway to a stilling basin at the southern base of the dam.
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