A section of a penstock pipe arrives at the mouth of an adit leading to the interior of one of the diversion tunnels during the construction of Hoover Dam.
From the Morgan Sweeney Photograph Collection (PH-00228). Number 2 Warehouse the contractors yard on November 28, 1950. Stamp on the back reads, "Photograph by Bureau of Reclamation BCP # 8120 Boulder Canyon Project Boulder City, Nevada."