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Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood. View of the flooded Colorado River in Black Canyon during construction on Hoover Dam. The portals of diversion tunnels nos. 3 and 4 are seen in the canyon wall and bridges and catwalks cross the river. Some buildings...
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Looking across the river at the lower portal of Diversion Tunnel No. 3. View of the flooded Colorado River, facing the unfinished portal of diversion tunnel no. 3 during construction of Hoover Dam. A temporary building is seen on the riverbed in the flood waters.
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Gas-air shovel caught in the flooded Colorado River A stranded gas-air shovel is seen standing in the flooding of the Colorado River riverbed during construction on Hoover Dam. The mouth of one of the diversion tunnels is seen in the canyon wall in the background. Other construction equipment...
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Partially washed-out truck bridge across from diversion tunnels View from a partially washed-out truck bridge, looking across the flooded Colorado River during construction of Hoover Dam. The mouths of two diversion tunnels are seen in the cliff wall in the background.
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Dragline loading gravel An electric dragline is seen loading gravel into a railway dump car in a gravel pit. Some workers stand beside the equipment. Mountains are seen in the background.
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Dragline loading gravel into side-dump car A dragline dumps gravel into the railway dump car in a gravel pit. Plymouth gasoline locomotive switching. Construction workers are seen observing the operation.
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Trash rack structure being installed in front of diversion tunnel no. 2 Close-up of construction workers installing the foundations of a trash rack in front of the portal of diversion tunnel no. 2. This is where the first pay concrete was poured.
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Construction near the upper portals of diversion tunnels no. 1 and no. 2 High scalers work on the cliff face above the unfinished portals of diversion tunnels no. 1 and no. 2. Construction equipment, trucks and workers are seen on the road in front of the tunnels. Rigging and ropes hang from...
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Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the... View out of the upper portal of the unfinished diversion tunnel no. 2. A Bucyrus-Erie 43-B gas-aire shovel is seen near the mouth of the tunnel and reflected in a pool of water inside the tunnel. A man...
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Workers and drilling jumbo inside diversion tunnel no. 4 Construction workers are seen working with a drilling jumbo inside diverson tunnel no. 4.
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Close-up of workers using a drilling jumbo inside a diversion tunnel Close-up of construction workers using a drilling jumbo to excavate the interior of one of the diversion tunnels. The tunnel is illuminated by floodlight.
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Construction worker in bulldozer in front of diversion tunnel portal A construction worker sits in a Caterpillar bulldozer in front of an unfinished diversion tunnel portal.
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Worker inside drill sharpening station A worker is seen inside a drill sharpening station using a drill sharpener. A hot forge is also seen inside the building in the foreground.
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Construction of the highway which will cross the top of the dam View of construction on the highways which will cross the top of the dam in Black Canyon. A rubble stone masonry retaining wall is in place.
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Looking downstream on the Colorado River running through Black Canyon prior to construction of Hoover... A man sitting on a rock ledge views the Colorado River running downstream through Black Canyon prior to the construction of Hoover Dam. Bridges and catwalks are suspened over the river and dirt roads can been seen on both...
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Construction workers using a drilling jumbo inside a diversion tunnel Construction workers using a drilling jumbo to excavate one of the diversion tunnels.
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Screened aggregate and sand in front of the gravel plant View of the gravel plant, with cars and trucks parked in the foreground. Piles of screened aggregate and sand are seen in the foreground, and a storage pile for raw aggregate is seen in the background. The mountains...
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Night view of the gravel plant Night view of the gravel plant, which is illuminated with electric lights. Piles of raw aggregate and a building stand in the foreground.
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Electric shovel loading rocks into dump truck Close up of an electric power shovel loading rock and debris into a dump truck. A driver sits in the truck.
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Worker sitting in dump truck being loaded by power shovel Close up of a construction worker sitting in a Mack truck which is being loaded with debris by a power shovel.
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Dump truck unloading debris during construction of muck disposal road View of a dump truck unloading debris during construction of a roadway. One construction worker sits behind the wheel of the truck and two others stand by observing from the road.
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Invert concrete pouring forms inside diversion tunnel Interior of a diversion tunnel, showing invert concrete pouring forms. Some construction workers can be seen in the foreground. The tunnel is illuminated by electric lights.
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Gantry crane inside diversion tunnel no. 3 A gantry crane is seen inside a diversion tunnel during construction of Hoover Dam. A flat bed truck is seen on the tunnel floor in the foreground and construction workers stand by. The tunnel is illuminated by electric...
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Invert forms inside diversion tunnel no. 3 Interior of diversion tunnel no. 3, showing invert forms used for pouring concrete slabs. A trimming jumbo used for aligning the gauge of the tunnels is seen in the background. The tunnel is illuminated by electric lights.
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Blasting in the walls of Black Canyon for intake tower construction View of rock blasting in Black Canyon in preparation for construction of the Hoover Dam intake towers.
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Concrete lining inside diversion tunnel no. 2 View of the interior of diversion tunnel no. 2, showing the completed invert and side wall sections of concrete lining. The tunnel is illuminated by electric lights. On the tunnel floor, construction workers stand by a truck which is...
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Concrete side wall lining in diversion tunnel no. 3 View of the interior of diversion tunnel no. 3, showing completed side wall sections of concrete lining. The tunnel is illuminated by electric lights. Concrete pouring forms and a gantry crane are seen in the rear of the tunnel.
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Side-wall jumbo inside diversion tunnel View of the interior of a diversion tunnel showing the side-wall jumbo used for placing of the concrete tunnel lining. The tunnel and jumbo are illuminated by electric lights. A construction worker stands in the foreground. A truck...
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Construction of steel forms for the lining of the diversion tunnels View of outdoor construction of steel forms to be used for lining the arch sections of the diversion tunnels. Construction workers are seen, one of them operating a bulldozer. A power shovel can be seen behind the steel...
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Steel form for diversion tunnel lining being hoisted into Black Canyon A completed section of steel form to be used for the lining of the diversion tunnels is hoisted by a cable into Black Canyon while construction workers supervise.
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Steel form for diversion tunnel lining being hoisted over the Colorado River A completed section of steel form to be used for lining the diversion tunnels is seen being hoisted on a cableway over the Colorado River. A construction worker can be seen standing on top of the form.
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High scalers preparing anchorages in Black Canyon Three high scalers prepare rope anchorages for future scaling work one thousand feet above the Colorado River in Black Canyon.
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Construction workers with electric light reflectors standing by a truck in Black Canyon Several construction workers in Black Canyon prepare reflectors for electric lighting from metal dishpans. Some of the workers stand in a truck bed and others stand beside the truck.
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Future Hoover Dam reservoir area seen from Black Canyon View from Black Canyon of the area which, when submerged, will become the Hoover Dam reservoir. In the foreground, a car is seen traveling a dirt road, and a lone construction worker views the scene from atop the rocks....
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Detail of a sidewall jumbo inside diversion tunnel no. 3 Close-up of a section of a side-wall jumbo inside a diversion tunnel set for concrete pouring of the tunnel's side walls. The form is 80 feet long and consists of four 20-foot sections bolted together. Measurements are marked...
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Detail of side-wall jumbo inside diversion tunnel Detail of a side-wall jumbo used for pouring concrete lining inside a diversion tunnel. The side wings of the jumbo are jacked into place, and concrete is poured through ports by means of a traveling crane and 2 yd....
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Section of a concrete-pouring jumbo standing outside of a diversion tunnel A completed section of a form, or "jumbo," for pouring of concrete to create the diversion tunnel arches stands upon trestles in Black Canyon. Construction workers are seen working on the form.
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Dragline loading gravel into railroad side dump cars View of an electric dragline loading railway side dump cars in the gravel pit in Black Canyon. Mikado type locomotives pull 10-car trains, 3 trains of this type [were] in operation.
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Man standing on trestle bridge on the Colorado River pointing at anchoring cables A man stands on the trestle bridge near the gravel pit and points at the cables attached to the upstream face of the bridge used to anchor the bridge in case of high water. Three-inch cables [were] anchored to...
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High scalers on the Nevada side of Black Canyon High scalers work on the canyon wall on the Nevada side of Black Canyon, excavating for construction of an intake tower. Bridges can be seen in the distance crossing the Colorado River.
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High scalers on the Nevada side of Black Canyon above the Colorado River Close-up of high scalers working on the Nevada side of Black Canyon, 700 feet above the Colorado River. Two bridges are seen crossing the river below.
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Close-up of construction workers rigging a cableway over the Colorado River Two construction workers are seen rigging a "skip," or platform, to a cableway above the Colorado River in Black Canyon. The skip will be used to cross the river above the canyon.
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Construction workers on cableway transport over the Colorado River Construction workers are seen being transported over the Colorado River in Black Canyon via a "skip," or platform, attached to overhead cableways.
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Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast. A close-up of the portals to diversion tunnels no. 3 and 4 on the Colorado River. Construction workers prepare equipment for a blast. A truck loaded with lumber can be seen between the tunnels.
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Dumping materials at temporary pile bridge to complete diversion of the Colorado River. Dump trucks dump materials into the Colorado River to from a temporary bridge in order to divert the river into the diversion tunnels. Several construction workers carry out and supervise the operation and a large group watches from the...
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Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and... View of the temporary dike created to divert the Colorado River into the diversion tunnels. Dump trucks and construction workers are seen on the temporary pile bridge and the portals of diversion tunnels no. 3 and 4 are seen in...
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Panoramic view of the Upper Cofferdam, looking downstream Panoramic view of construction in the upper cofferdam of Hoover Dam in Black Canyon. A dragline is seen in the middle of the canyon floor. Several trucks, construction equipment and construction workers are also seen in the canyon.
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Concrete pouring forms in the Hoover Dam construction site in Black Canyon Aerial view of the Hoover Dam construction site in Black Canyon showing multiple concrete pouring forms in front of a cofferdam. Draglines and trucks can be seen on the canyon floor, and overhead cableways carry cargo across the site.
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Cut-off trench at upstream side of Hoover Dam. Construction workers and equipment are seen in a cut-off trench in the upstream side of the Hoover Dam construction site.
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Concrete pouring forms below a cofferdam in the Hoover Dam construction site Construction workers are seen working on the concrete pouring forms below a cofferdam in the Hoover Dam construction site. Concrete begins to set in the forms. A dragline can be seen in the distance and lines for high scalers are...
 

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