Wetting Down Concrete at Shasta Dam December 1941

Workers wet down freshly poured concrete at Shasta Dam in Shasta County, California, in December 1941. Built in the 1930s as part of a New Deal program, Shasta Dam is one of the largest concrete dams in the U.S. It plays a vital role in water management and hydroelectric power generation in California. The concrete curing methods in this image reflect engineering practices of the time.

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