Hoover Dam: The Dam That Tamed America's Wildest River

The Hoover Dam — a 726-foot wall of concrete built in the middle of the Great Depression to tame the wildest river in America. Built 1931–1936 by Six Companies Inc. on a $48.9 million contract, from 3.25 million cubic yards of concrete — in the Bureau of Reclamation's own words, enough to pave a highway 16 feet wide from San Francisco to New York. Engineers threaded 582 miles of steel pipe through the concrete and pumped ice water through it, because a single pour would have taken 125 years to cool. The Colorado was diverted through four 56-foot tunnels; high scalers dangled from ropes to clear the canyon walls. 96 workers died on the site. Lake Mead — America's largest reservoir, 112 miles long — filled behind it. 17 turbines generate 2,080 megawatts. Dedicated by Franklin D. Roosevelt on September 30, 1935, and handed over more than two years ahead of schedule. CHAPTERS 0:00 A 726-foot wall in the desert 0:37 The wild Colorado River 1:24 The gamble: moving a river 2:32 The human cost 3:43 Cooling concrete with ice water 4:38 Lake Mead and 2,080 megawatts 5:45 Hoover, Boulder, Hoover — the dedication 6:54 The blueprint 🔔 Subscribe to The Impossible Blueprint for a new engineering giant every week. ⚠️ AI-generated content — 1930s construction footage is public-domain archival material (labeled ARCHIVE); other visuals are AI reconstructions labeled AI in the video (altered-content disclosure enabled). #megaprojects #engineering #hooverdam #documentary #impossibleblueprint