Construction of the Hoover Dam began on July 7, 1930. Located on the Colorado River at the border between Arizona and Nevada, the dam was one of the most ambitious engineering projects of its time and a significant part of the American efforts to control flooding, provide irrigation water, and produce hydroelectric power. Upon completion, the Hoover Dam stood as a symbol of modern American ingenuity and a testament to the country’s ability to undertake and complete massive infrastructure projects during the Great Depression.