A Union Pacific Railroad train as a part of the construction for Hoover Dam. The front of the card reads: "First train in railroad pass, Boulder Dam Project, Oakes." Description given with postcard: "SP, LA & SL (UPRR) locomotive 6082 in Railroad Pass. Maybe spreading ballast on track."

Black and white image of a crowd of people gathered together for the Boulder Junction, a ceremony celebrating the beginning of work on Boulder Canyon Project and the beginning of construction on a Union Pacific Railroad from Boulder Junction (Bracken Junction) to the dam site. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

An image of Rotary Club members attending a lunch near Boulde Dam (officially renamed Hoover Dam in 1947). Three unidentified men stand beside each other eating food and wearing chef hats.

A black and white image of U.S. Marshal Claude Williams and his family in front of his office. The words "U.S. Marshal" are spelled out in white rocks in front of the building.

An image of people sitting at the head table at a Rotary Club luncheon at Boulder Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

An image of Rotary Club members having lunch at Boulder Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

An image of Rotary Club members having lunch at Boulder Dam. Earl Brothers is also present in this photograph. Note: Boulder Dam was officially renamed Hoover Dam in 1947.