An interior view of Boulder Dam's powerhouse; an unidentified man stands in front of one of the newly completed power generators. Boulder Dam was officially renamed Hoover Dam in 1947.
A view of the interior of Boulder Dam, as seen from a visitor viewpoint platform; a man leans against the railing, looking down at power generators below. Boulder Dam was officially renamed Hoover Dam in 1947.
The view of a penstock tunnel located within the interior of Boulder Dam. Visitors of the dam stand above a bridge overlooking the tunnel. Boulder Dam was officially renamed Hoover Dam in 1947.