The construction of the Hoover Dam on the Colorado River was one of the greatest civil engineering projects in U.S. history. Hundreds of people--designers, architects, electrical engineers, many fearless laborers, and others--were needed to bring this massive project to life. The result was a gigantic arch-gravity dam and the largest hydroelectric facility on the planet at the time. The dam resulted in the creation of Lake Mead, a reservoir that supplies water and electricity to millions of American citizens. Stunning photographs and primary sources give readers a true sense of the human skill, craftmanship, and ingenuity needed to make the Hoover Dam a reality.