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| Phase of the Hoover Dam - April 27, 1934 Location: Clark County, NV and Mohave County, AZ Constructed 1931-1936; Dedicated September 30, 1935 A total of 3,250,000 cubic yards of concrete was used in the dam More than 582 miles of cooling pipes were placed within the concrete Employment peaked in 1934 at 5,251 |
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