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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]
The upper and lower reservoirs are created by earth and rock-filled embankment dams.The upper reservoir dam is 460 feet (140 m) high, 2,200 feet (670 m) long and has a structural volume of 18,000,000 cubic yards (14,000,000 m 3).
The dam produces hydro-electric power mostly during hours of peak demand on the American Electric Power system. Water passes from Smith Mountain Lake through generators to Leesville Lake, producing power. In times of low demand, the generators are used as pumps to reverse the flow and return the water to Smith Mountain Lake.
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).
The river is 24.7 miles (39.8 km) long, [6] and its watershed covers about 590 square miles (1,528 km 2).It is formed by the confluence of Broad Run and Cedar Run in Prince William County; Bull Run, which forms Prince William County's boundary with Loudoun and the northerly part of Fairfax counties, enters it east-southeast of Manassas, as the Occoquan turns to the southeast.
The John H. Kerr Reservoir (often called Kerr Lake in North Carolina and Bugg's Island Lake in Virginia) [1] is a reservoir along the border of the U.S. states of North Carolina and Virginia. The U.S. Army Corps of Engineers constructed the John H. Kerr Dam across the Roanoke River between 1947 and 1952 to produce hydroelectricity as well as ...
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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]