Hoover Dam penstocks and outlet pipes such as this one were fabricated from 45,000 tons of steel and welded into nearly three miles of pipe varying from 8.5-30ft (2.6-9m) in diameter.

20 Very Interesting Photos From The '30s

Hoover Dam penstocks and outlet pipes such as this one were fabricated from 45,000 tons of steel and welded into nearly three miles of pipe varying from 8.5-30ft (2.6-9m) in diameter.

The Hoover Dam under construction, c.1935

The Hoover Dam under construction, c.1935

Hoover Dam (also known as Boulder Dam) under construction, February 1, 1935 :: California Historical Society Collection, 1860-1960

Hoover Dam (also known as Boulder Dam) under construction, February 1, 1935 :: California Historical Society Collection, 1860-1960

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Hoover Dam construction - Dick Whittington Studio/Corbis via Getty Images

Hoover Dam construction - Dick Whittington Studio/Corbis via Getty Images

"High scalers" use jackhammers to shave loose rock off the walls of Black Canyon during the construction of the Hoover Dam, 1935.

"High scalers" use jackhammers to shave loose rock off the walls of Black Canyon during the construction of the Hoover Dam, 1935.

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