Looking downstream the Colorado River from a point below the lower portals of the diversion tunnels of the Hoover Dam. Muck disposal shown on both sides of the Colorado river. Site Name: Hoover Dam (dam)
A flashlight photograph of the interior of one of the diversion tunnels. The drilling jumbo is working at the tunnel face. The 12' by 12' top-heading can be plainly seen. January 28, 1932.