Black and white image of Hoover Dam construction. A cat-walk is visible, spanning the canyon over the upstream cofferdam. The span is approximately between triangulation points C-7 and C-8. Elevation at the middle of the span is approximately 1,005 feet. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
An image of water flowing over one of the Hoover Dam spillways. Electric transmission towers in Black Canyon are visible in the background, and automobiles are parked in an observation area in the foreground. Note: Boulder Dam was officially renamed Hoover Dam in 1947.