Black and white image of Dr. Ray Lyman Wilbur, Secretary of Interior, naming the Boulder Dam (name officially changed to Hoover Dam in 1947) at a ceremony celebrating the beginning of work on the Boulder Canyon Project and the beginning of the construction of Union Pacific Railroad from Boulder Junction (Bracken Junction) to the dam site.
Black and white image of Secretary of the Interior, Dr. Ray Lyman Wilbur, on a tour of inspection at Hoover Dam. It was under Dr. Wilbur's supervision that the Boulder Canyon Project was commenced. In the background the concrete form used in lining the 50-foot diversion tunnels at the outlet portal of Diversion Tunnel No. 2 can be seen. Note: Boulder Dam was officially renamed Hoover Dam in 1947.