The face of Hoover Dam as seen from the river. Part of the power plant's hydroelectric generators, as well as the canyon wall outlets and stoney gate are visible on the Nevada (left) side. The spillway tunnel is visible on the Arizona (right) side. During the years of lobbying leading up to the passage of legislation authorizing the dam in 1928, Hoover Dam was originally referred to "Boulder Dam" or as "Boulder Canyon Dam", even though the proposed site had shifted to Black Canyon. The Boulder Canyon Project Act of 1928 (BCPA) never mentions a proposed name or title for the dam. When Secretary Wilbur spoke at the ceremony starting the building of the railway between Las Vegas and the dam site on September 17, 1930, he named the dam "Hoover Dam", citing a tradition of naming dams after Presidents, though none had been so honored during their terms of office. After Hoover's election defeat in 1932 and the accession of the Roosevelt administration, Secretary Ickes ordered on May 13, 1933 that the dam be referred to as "Boulder Dam". In the following years, the name "Boulder Dam" failed to fully take hold, with many Americans using both names interchangeably and map makers divided as to which name should be printed. In 1947, a bill passed both Houses of Congress unanimously restoring the name to "Hoover Dam".

From Harvey's Hotel and Casino Postcard Collection (PH-00367)

An image of automobiles on the road over the top of the face of Hoover Dam. Two of the intake towers and one of the spillways are visible in the background. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

A view of the rest room area at the Hoover Dam's powerhouse and its terrazzo floor.

An image of a man delivering a speech before the unveiling of the memorial plaque at the Hoover Dam.

An image of a man delivering a speech before the unveiling of the memorial plaque at the Hoover Dam.

An image of the Arizona inset in the statue flooring at the Hoover Dam on the day of the dam's dedication.