High scaling during early constuction at Boulder Dam [left], Transporting men by cableway, Boulder Dam [middle], Boulder Dam dowstream face and power house [right], 1931-1936

Hoover (Boulder) Dam, taken from the upstream side of the dam on the Arizona side, May, 1947. The intake towers, Nevada spillway house (in the background, behind the intake towers), and the Nevada spillway are visible. 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

Hoover (Boulder) Dam, taken from the upstream side of the dam on the Arizona side, May, 1947. The intake towers, Nevada spillway house (in the background, behind the intake towers), and the Nevada spillway are visible. 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".

Hoover Dam was originally called the Boulder Dam from 1933-1947, but was renamed the Hoover Dam by a joint resolution of Congress. Site Name: Hoover Dam (dam)

An image of the upstream face of Hoover Dam. The name was officially changed from Boulder Dam to Hoover Dam in 1947.

An image of the upstream face of Hoover Dam. The name was officially changed from Boulder Dam to Hoover Dam in 1947.

An image of the upstream face of Hoover Dam. The name was officially changed from Boulder Dam to Hoover Dam in 1947.