Railroad construction & maintenance / Tunnels / Aerial photographs / Rivers Source :NARA-NRG NaraID :115-CONSTPHO-85006-BOULDERCANYON2-1230 Photographer :N/A Personal Name :N/A Topical Name :Nevada Diverson Tunnel Geographical Name :Black Canyon Institution Name :Bureau of Reclamation / Engineering and Research Center Bureau of Reclamation. Engineering and Research Center. Date :06/01/1932 State :NV Country :USA

“Looking into Black Canyon at Nevada Diversion Tunnel intake portals from top of canyon wall on Arizona side. Trash rack structure and temporary cofferdam are seen. Fill at right is roadbed for Elev. 720 railroad construction which will pass over tunnel portals on trestle and enter tunnel at left. Note top arch concrete jumbo forms being assembled in front of portals.“

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