A view of visitors boarding an elevator on "[the] Highway on crest of Boulder Dam, with elevator tower where visitors are conducted by guides to powerhouse." Boulder Dam was officially re-named Hoover Dam in 1947.

An image of Rotary Club members having lunch at Boulder Dam while an unidentified man stands up to give a speech. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

An image of Rotary Club members having lunch at Boulder Dam while an unidentified man stands up to give a speech. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

An image of Rotary Club members having lunch at Boulder Dam while an unidentified man stands up to give a speech. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

A grayscale view of Boulder City, Nevada; Boulder Dam Hotel, located at 1305 Arizona Street, and a building sign advertising "free Boulder Dam motion pictures" can be seen in the background.

An image of an interior view of the Hoover Dam powerhouse under construction. Caption on bottom of image reads: "Interior of power house. Boulder Dam. Nevada." Boulder Dam was renamed Hoover Dam in 1947.