This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Evaporation tower for Boulder Dam precooling system located on downstream cofferdam. View from Nevada outlet valve... NARA .tif Scope and content Photograph from Volume Two of series of photo albums documenting the construction of Hoover Dam Boulder City Nevada General notes Local identifier Department of the Interior Bureau of