| http://www.w3.org/ns/prov#value | - Construction on this mammoth structure began in 1930.Named for America's 31st President Herbert Hoover, Hoover Dam is the highest concrete dam in the Western Hemisphere, standing at more than 725 feet above the Colorado River.Construction on the Mike O'Callaghan - Pat Tillman Memorial Bridge was completed in 2010, offering views of the dam from an entirely new vantage point.More than a million peo
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