A view of equipment being lowered into Hoover Dam.

Colorado River-Hoover Dam. View showing construction work on powerhouse. Photo from a book or a magazine; inscription reads: "With the dam proper completed, construction work on the power house is being rushed to completion 24 hours of the day." Site Name: Hoover Dam (dam)

Trucks and construction equipment during the construction of Hoover Dam, 1930s.

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.

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.

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

150-man transport, Boulder Dam [left], Night Scene in Las Vegas [left], 1931-1936