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Boulder City, city, Clark county, southeastern Nevada, U.S., overlooking Lake Mead, which is impounded by the Hoover Dam. Lying above the deep, narrow Black and Boulder canyons of the Colorado River on the Nevada-Arizona border, it was established in 1931 by the federal government as a residential community for personnel employed at Hoover (Boulder) Dam and other local construction projects, including Lake Mohave and Davis Dam. From 1931 to 1935, during the construction of the...