At the time of its completion in 1936, Hoover Dam was the biggest dam in the world and the largest feat of architecture and engineering in the country--a statement of national ambition and technical achievement. It turned the wild Colorado River into a tame and securely managed water source, transforming millions of acres of desert into farmland while also providing water and power to the fast-growing population of the Southwest. The concrete monolith quickly became a symbol of American ingenuity; however, its history is laden with contradiction. It provided work for thousands, but it was a dangerous project that exploited desperate workers during the Depression. It helped secure the settlement and economies of the Southwest, but at the expense of Indigenous peoples and the environment; and it created a dependency on the Colorado River's water, which is under threat from overuse and climate change.

Weaving together elements of engineering, geography, and political and socioeconomic history, and drawing heavily from unpublished oral histories taken from dam workers and their families, Simon Boughton's thoughtful and compelling debut--featuring historical photographs throughout--follows the construction and impact of Hoover Dam, and how its promise of abundance ultimately created a river in crisis today.