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)
The filling of the Hoover Dam after the completion of the construction. It was previously called the Boulder Dam, and in 1947 it was officially renamed the Hoover Dam. Written on the top of the photo: "BDRA. NEV. 4.36 350." Site Name: Hoover Dam (dam)
The filling of the Hoover Dam after the completion of construction. This photograph was taken when it was called the Boulder Dam. It was officially renamed the Hoover Dam in 1947. Written on the top of the photo: "BDRA. NEV. 4.36 343." Site Name: Hoover Dam (dam)
Water gushing at the Hoover Dam when it was called the Boulder Dam. In 1947 it was renamed the Hoover Dam. Written at the top of the photo: "BDRA. Nev. 4.36 342." Site Name: Hoover Dam (dam)