How was it built: History and engineering
Hoover Dam was constructed during the Great Depression (1931–1936) to control flooding, provide water, and generate hydroelectric power for the southwestern United States. Built by Six Companies, Inc., and executed by thousands of workers, the project overcame extreme desert heat, deep canyon excavation, and engineering challenges previously considered impossible.
The project’s engineering was groundbreaking at the time: the dam’s arch-gravity design distributes the immense weight of water against the canyon walls, while innovative cooling techniques prevented the concrete from cracking during the curing process. The power plant’s turbines and generators converted the Colorado River’s flow into hydroelectricity, supplying power to millions across the American Southwest.