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Bosher's Dam is a historic low head dam (also called a weir) built upon the James River just west of Richmond, Virginia.It is a 12-foot-high stone structure which interrupts the natural flow of Virginia's largest self-contained river by spanning the waterway between suburban Tuckahoe in Henrico County and the western part of Richmond just west of the Edward E. Willey Bridge.
The dam serves flood control and recreational purposes and is operated by the U.S. Army Corps of Engineers. [2] The Gathright Dam's intake tower contains nine portals that allow it to release water between reservoir depths of 12 to 87 feet (3.7 to 26.5 m). This allows the dam to manage the temperature and flow of water released downstream. [3]
The dam is 250 feet (76 m) high and 916 feet (279 m) long. The earth-filled dam is constructed of rock with a central clay core, which prevents water from passing through the dam. A 1,145-acre (463 ha) lake is formed behind the dam with almost 40 miles (64 km) of shoreline. South of the dam is the emergency spillway.
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).
Smith Mountain Dam is a concrete arch dam located on the Roanoke River in Virginia, creating Smith Mountain Lake. The dam was built by Appalachian Power (a division of American Electric Power ) between 1960 and 1963 for the purposes of pumped-storage hydroelectricity .
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 ]
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