Rising 726 feet above the Black Canyon and stretching 1,244 feet across the Colorado River, the Hoover Dam remains one of the most extraordinary engineering achievements of the 20th century. Built between 1931 and 1936 during the depths of the Great Depression, the project employed more than 21,000 workers and used 3.25 million cubic yards of concrete—enough to pave a two-lane highway from San Francisco to New York. The Hidden Engineers of the Hoover Dam tells the full story of how this colossal structure came to life. Inside, readers will discover the national need for water and power that drove Congress to authorize the project in 1928; the diversion of the Colorado River in 1931 using massive tunnels; the workforce experience and establishment of Boulder City; key innovations such as the concrete cooling system and hydroelectric generators; the 1935 dedication ceremony; and the lasting impacts on irrigation, flood control, and electricity. This book offers a fact-driven yet engaging account of the Hoover Dam—its planning, construction, controversies, and enduring role in shaping the modern American West.