Construction of the Hoover Dam
Herbert Hoover drafted the agreement which allowed the dam on the Colorado River to move forward. Construction began during his Presidency in 1932.
Work began on the four tunnels that were needed to divert the river so that the dam could be built on dry land. These tunnels, 56 feet in diameter, were completed on November 14, 1932.
On June 6, 1933, after excavating the riverbed and clearing the canyon walls, the first concrete of the dam structure was poured.
Using cableways, concrete was transported in buckets over the canyon and poured into forms and cooled using a system of pipes. Concrete was also used to build intake towers, spillways, and penstocks.
The last concrete for the dam was poured on February 21, 1935. The completed dam, an amazing feat of engineering and logistics, was turned over to the federal government a little over a year later.
Photo of concrete being lowered to the Boulder Dam. December 5, 1934.
Building the Hoover Dam - from the Presidential Timeline