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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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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 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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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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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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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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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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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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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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Hoist House and Nevada Anchorage, Government Cableway. Cables run through a tower in Black Canyon. Two men stand at the foot of the anchoring cables outside a hoisting mechanism building in the Hoover Dam construction site. Trucks and temporary buildings are seen outside the hoisting house.
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Concrete plant Shows the blending plant on the side of Black Canyon; it is part of the Himix Concrete Plant.
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Nevada spillway during construction of Hoover Dam Photo shows men working on the Nevada spillway weir. There are concrete forms, various buildings, construction equipment, and a truck in the scene.
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Nevada spillway during construction of Hoover Dam Close-up of the Nevada spillway, looking downstream, during the construction of Hoover Dam. Cables, construction equipment, and roads are visible.
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Interior of spillway tunnel, Hoover Dam site Shows concreting equipment inside No. 1 spillway tunnel during the construction of Hoover Dam.
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Hoover Dam during construction View of Hoover Dam site, looking upstream. A railroad winds along the canyon and the Colorado River is visible above the dam site. Buildings and structures, high scaling equipment, and concrete forms are also visible.
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Hoover Dam under construction View taken high above Hoover Dam construction site showing the forms for poruing the concrete. There are trucks, buildings, a railroad, and roads visible. The Colorado River can be seen above the site. Other construction equipment shown includes...
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Interior of diversion tunnel during Hoover Dam construction View of interior of diversion tunnel No. 3 during the construction of Hoover Dam.
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Hoover Dam during construction View of the Hoover Dam construction site from high above showing forms for the poring of the concrete, looking downstream. There are trucks, a train along the canyon wall, and buildings in the picture. Construction equipment includes...
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Spillway weir under construction -- Hoover Dam site Shows the Nevada spillway weir under construction. Scaffolding, temporary stairways, a construction shed, and other equipment can be seen.
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Construction of intake towers and spillway -- Hoover Dam site Site where the intake towers and the spillway on the Arizona side of the dam are being built. Construction roads, high scaling equipment, and other construction equipment can be seen.
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Construction of Hoover Dam intake towers Photo shows the site of the construction of the intake towers on the Nevada side of the dam. High scaling equipment, a crane, scaffolding, construction buildings and equipment are visible.
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Hoover Dam under construction Aerial photo of the Hoover Dam construction site showing forms for poring concrete. Forms for the power house gallery are visible. A train winds along the canyon wall, there is high scaling equipment on the walls, and the...
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Construction of diversion tunnels -- Hoover Dam site View of construction taking place at the upper portals of the diversion tunnels for Hoover Dam. Power shovel, buildings, roads, and scaffolding can be seen. Only the exterior portions of the tunnels are visible.
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Himix Concrete Plant at Hoover Dam site View of the Himix Concrete Plant at the Hoover Dam site. The structure is mutli-storied and built into the side of the canyon. There is a flatbed truck with a cement bucket on the back and cement mixers...
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Close-up of Hoover Dam construction A close-up view of Hoover Dam construction. There is a railroad running along the canyon, concrete forms, a truck, and a building. Temporary stairways have been built into the canyon walls.
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Construction of Hoover Dam intake towers Shows site where the intake towers are being constructed on the Arizona side of Hoover Dam. Shows high scaling equipment and various structures including the boom derrick.
 

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