In 1933, an ambitious project was underway in the middle of the desert on the Arizona-Nevada border. Dozens of men dangled from long ropes along the tall canyon walls hundreds of feet above the Colorado River. The workers used jackhammers to drill holes into the rock, and then placed dynamite into each hole. Boom! Boom! Boom! This dangerous—and sometimes deadly—work was just the beginning of the construction of the Hoover Dam. The Hoover Dam traces the incredible story of the colossal structure, from its construction to its important modern-day use—including preventing floods and providing electricity to millions of people. Large color photos, maps, and fact boxes enrich the captivating story, which is sure to excite even the most reluctant readers.