Black and white image of several prominent figures, in front of a crowd outdoors. From left to right: Governor Balzar of Nevada; Carl Gray, President of Union Pacific Railroad Company; Ray Lyman Wilbur, Secretary of the Interior; Governor of Colorado (possibly Edwin C. Johnson). Gray is handing Lyman the first spike to be driven for the spur line to Boulder Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

This photograph has three images. The first one (0272_0078) reads "'Form Raising Crew' - cont. - Whitie, Indiana 'Hoosier', lining the bolt up from inside. Always looking for a hammer, or bar, when it was time to climb over the top." The second one (0272_0079) reads, "Drilling jumbo in mouth of spillway tunnel," as a handwritten inscription. The third image (0272_0080) reads, "Nevada spillway with flood gates lowered. Notice size of man in gates. Constructed to prevent flood waters from overflowing dam. Each spillway - capable of passing 200,00 cu. ft. per second."