7Hoover Dam, Arizona and Nevada
Once named Boulder Dam, this dam is located in the Black Canyon of the mighty Colorado River near Boulder City at the border of Nevada and Arizona. It is an arch-gravity structure made of concrete. Construction time ran from 1931 to 1936.
It involved unproven technologies and thousands of workers. One hundred men lost their lives but the dam was finished two years ahead of time. It was officially dedicated by then-President Franklin D. Roosevelt on September 30, 1935. The dam is a popular tourist stop. Roughly one million people visit it every year.
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