An image of the diversion tunnels in use on the newly completed Hoover (Boulder) Dam.

p.5 #948 Foundations for the trash rack structure being installed in front of upper portal of Diversion Tunnel no.2. This is where the first pay concrete was poured. Mar. 7, 1932. p.5 #943 View of gravel plant, showing live storage of screened aggregate and sand in foreground. Storage pile for raw aggregate in background. Mar. 2, 1932. p.5 #951 Upper portals of Diversion Tunnels No.1 and 2. Note workmen scaling above portal of Diversion tunnel No.1. Mar. 7, 1932. p.5 #937 Night view of gravel plant, taken near first scalping screen, and looking in opposite direction than the view on left. Feb. 26, 1932.

An aerial view showing Hoover Dam, Lake Mead, and diversion tunnels in use.