Hoover Dam

October 18, 2026

AI Summary

5 min read

In late November 1932, 28-year-old high scaler Oliver Cowan was suspended 700 feet above the Colorado River in Black Canyon, whistling as he worked. His job was to strip loose rock from the canyon face so the Hoover Dam could be built against a clean surface. When a shout went up and an engineer lost his balance on a ledge above, Cowan swung across the rock face, grabbed the falling man by the trouser leg, and held him until another worker helped pin him to the cliff until a rope line dropped. After the engineer was hauled to safety, Cowan went back to his jackhammer. Such moments were routine during the dam's construction — a project that rerouted a great river, employed 21,000 men, and cost 112 known lives before it was finished.

The problem the dam was meant to solve

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What you'll learn

1 Hoover Dam — Timestamped Outline
2 (00:47) **High Scalers at Work** - Opens with 28-year-old Oliver Cowan dangling 700 feet above Black Canyon, using a tar-hardened hat and 44-pound jackhammer to strip loose rock, then catching a falling engineer mid-air
3 (04:20) **The Dam as a Modern Wonder** - Sets up the episode's central questions: what it took to build this feat of engineering, why it mattered, and whether the sacrifice was worth it nearly 100 years later
4 (05:41) **The Problem of the Colorado River** - Professor Michael Green explains that the river's cycle of drought and flooding had to be broken for the American Southwest to develop
5 (09:48) **Black Canyon and Political Opposition** - The site shifts 20 miles downriver to Black Canyon, with jagged volcanic cliffs, but faces resistance from wealthy landowners and private utilities who fear government-backed power will drive them out of business
6 (12:08) **Los Angeles Commits to Buy the Power** - Engineer William Mulholland promises to purchase whatever energy the dam's hydroelectric plant can produce, knowing LA needs massive power to become the metropolis he envisions
7 (14:08) **The Swing-Johnson Act and the Great Depression** - President Coolidge signs the Boulder Canyon Project Act in December 1928 with $165 million set aside, but the stock market crash of October 1929 — Black Thursday — throws the nation into the Great Depression

+ Full timestamped outline available in the app

Show Notes

Truly a modern wonder of the world, the Hoover Dam is one of the great feats of human ingenuity. Its creation was a saga of large-scale ambition and engineering genius executed by a labour force of thousands working in gruelling conditions. The project involved the rerouting of a great river and the construction of a vast concrete edifice, and began as America was in the midst of an unprecedented economic slump.

But just what did it take to build this extraordinary landmark? Why was it considered such a vitally important project – and at what cost? And, almost 100 years since construction began, can it now be said that the sacrifice was worth it?

This is a Short History Of the Hoover Dam.

A Noiser podcast production. Hosted by John Hopkins. With thanks to Michael Green, Professor of History at the University of Nevada, Las Vegas.

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