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The dam rises 550 feet (168 m) above bedrock and originally measured 3,867 feet (1,179 m) along its crest.
The dam rises 440 feet (134 m) above ground level and has a crest 2,201 feet (671 m) wide and a volume of 10,451,000 cubic yards (7,991,000 cubic m).
The west dam rises to 285 feet above the valley floor.
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Behind the dam rose Lake Mead, the largest artificial lake in the U.S., capable of holding more than two years of the Colorado's flow.
Multiple species of wild Pacific salmon, which migrate between freshwater rivers and the saltwater ocean, are listed as endangered species, their numbers threatened by declining river habitat, hydroelectric dams, rising water temperatures and other factors.
The dam, which rises as high as 307 feet in some places, is owned by New York City, which is spending $31.4 million for its rehabilitation.
When it was completed, the dam structure rose 453 feet (138 metres) above ground level, was about 10,300 feet (3,140 metres) wide at its crest, and had a volume of 85.5 million cubic yards (65.4 million cubic metres).
Upon completion, due in 2001, the $4.2 billion dam will rise 154 metres (500 feet) high, stretch 1,677 metres across, and create behind it a reservoir big enough to hold 12.5 billion cubic metres of silt and water.In this section Power struggle The dammed No thanks, IMF Cambodia's many-headed monster Seeing is believing New south republic?
For the next fifteen months, a fleet of massive 125-ton (113 t) dump trucks delivered an almost constant stream of dirt and rock to the site, and the dam wall rose at an average rate of one and a half feet (0.5 m) per day.
What's more, the number of high-risk dams keeps rising as structures age, downstream development increases and more accurate information is obtained about watersheds and earthquake hazards.
In one finger of Lake Mead buildings that were abandoned in the 1930s, as the water of the newly dammed river rose and submerged them, have eerily begun reappearing, like a ghost town.The main reason why Lake Mead, currently only 40% full, has been getting emptier is a decade-long drought.
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