Public domain
Boulder Dam, between Arizona and Nevada, Apr. 1938. Power plant discharge from two 84-inch needle valves as seen from the high mountain downstream from the dam. Fortification mountain is in the background
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
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Credit lineBoulder Dam, between Arizona and Nevada, Apr. 1938. Power plant discharge from two 84-inch needle valves as seen from the high mountain downstream from the dam. Fortification mountain is in the backgr. 1938-01-01. United States. Bureau Of Reclamation. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.