Search for all of "Tunnels", all of "Standard Oil Co Of California", all of "Diversion Tunnels"

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Construction of Hoover Dam diversion tunnel and portal "View of upper portals tunnel #1. showing R.R. trestle and gate works." (inscription on back of photo) Concrete pouring forms are visible in the diversion tunnel.
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Construction of Hoover Dam "First load of muck used in coffer dam [sic]. Looking at Arizona portals #3 & #4. Water now flowing thru these." (hand-written inscription on back of photo) Shows a dump truck dumping the muck and construction...
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Construction -- Hoover Dam Handwritten inscription on back of photo: "Rex motor mixer that has been picked off a white truck and being swung into position at tunnel #1 with load of cement." Shows hoisting machinery, railroad tracks, a steam locomotive, a...
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Hoover Dam construction Shows one of the portals to the diversion tunnels. A portion of the Colorado River is visible as well as construction workers and construction buildings.
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Aerial view of Hoover Dam Aerial view of the completed Hoover Dam and the surrounding area showing the Colorado River below the dam and Lake Mead (the reservoir) above the dam. Water is flowing from the outlet works, and some of the portals to...

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