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The nearly 8100 major dams in the United States in 2006. The National Inventory of Dams defines a major dam as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3).
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On February 23, 2004, the 770 ft (230 m) long, 1910 hydroelectric Embrey Dam was demolished, using 600 lb (270 kg) of explosives, by divers from an engineering detachment at Fort Eustis. [2] The aim of removal was to re-open miles of spawning grounds to aid populations of American Shad , herring, catadromous American eel, and other species. [ 3 ]
John H. Kerr Dam is concrete gravity-dam located on the Roanoke River in Virginia, creating Kerr Lake. The dam was built by the U.S. Army Corps of Engineers between 1947 and 1953 for the purposes of flood control, and hydropower. The dam also serves wildlife resources, forest conservation, and public recreational uses.
Location: Alleghany County, near Kincaid, Virginia: Coordinates: 1]: Construction began: 1974: Opening date: 1979: Operator(s): U.S. Army Corps of Engineers: Dam and spillways; Type of dam: Embankment, rock-fill: Impounds: Jackson River: Height: 257 feet (78 m): Length: 1,310 feet (400 m): Width (base): 32 feet (9.8 m) (crest) 1,000 feet (300 m) (base): Reservoir; Creates: Lake Moomaw: Total ...
The lower reservoir dam on Back Creek is 135 feet (41 m) high and 2,400 feet (730 m) in length. It has a structural volume of 4,000,000 cubic yards (3,100,000 m 3 ) and creates a reservoir with a surface area of 555 acres (225 ha) and storage capacity of 27,927 acre-feet (34,447,000 m 3 ).
Dam and hydroelectric plant are located approximately one mile downstream of the larger Cushaw Hydroelectric Project; the address of the project is 7443 Elon Road (Virginia Route 130), Big Island, Virginia. This dam is the middle of three dams in rapid succession; the Big Island Dam is located several miles downstream.
It is formed by the Occoquan Dam on the Occoquan River. Managed by the Fairfax County Water Authority, it provides an important water supply to surrounding settlements in northern Virginia, with an output of 17 million US gallons a day (64,000 m 3 /d) to 1.2 million people, including over half of the population of Prince William County. [1]