Photograph of Hoover Dam (also known as Boulder Dam) under construction, February 1, 1935. The canyon (or river) is drained of any water. Temporary construction buildings or facilities are occupying the area just before the dam. A bridge(?) spans from one side of the canyon (left of the dam) to the right side of the canyon. Other temporary construction facilities are built on the side of the canyon. A conveyor belt runs from the base of the dam to the top (center). Skeletal framework of the buildings below the dam is visible in the foreground.; "Hoover Dam is known by the locals and old-timers as Boulder Dam. This name came from Boulder Canyon and yet the dam is built in Black Canyon. How did all this name confusion happen? By 1920, Govern...