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Hoover Dam construction equipment Handwritten inscription on back of photo: "16-rigger riding the hook on a cableway (one of nine that span Black Canyon). The highway approach to the dam from the Arizona side can be seen across the canyon."
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Crew operating construction equipment at Hoover Dam site Construction workers appear to be near the top of a canyon as they observe a coworker operating a power shovel which is being used to move rocks and boulders.
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Hoover Dam construction equipment Shows a box of equipment being lowered into Black Canyon during the construction of Hoover Dam. Cables, roads, and a truck are visible.
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Construction equipment -- Hoover Dam Shows a box of equipment being lowered by cable into Black Canyon during the construction of Hoover Dam. Roads and a truck are visible.
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Men operating heavy equipment at Hoover Dam site. There are two construction workers observing one worker operating construction equipment. The machinery appears to be digging a trench. There is a line of pipes standing vertically in the ground.
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Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam. Construction workers using construction equipment to drill railroad tunnels.
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Hoover Dam site, looking upstream Vehicles, men, and construction equipment are visible. This view was taken in the early stages of the construction of Hoover Dam in the bottom of Black Canyon.
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Penstock tunnel piping Two construction workers are seen standing in front of a piece of thirty foot diameter penstock tunnel piping, which is loaded on a wheeled platform.
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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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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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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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Bucket skips being filled with "muck" from the deep inner gorge of Black Canyon. Shows construction equipment and workers in the gorge of Black Canyon. Bucket skips are being loaded with muck to be transported out of the canyon. Also shows a power shovel and high scalers.
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Workers laying railroad track near Boulder Canyon Photo shows workers and machinery involved in laying railroad track near Boulder Canyon. There are several structures in the picture and mountains in the background.
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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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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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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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Men working on Hoover Dam. This photo shows two construction workers operating equipment used in the construction of Hoover Dam.
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Men operating heavy equipment at Hoover Dam site. he photo shows two construction dump trucks sitting in front of heavy equipment. This machinery appears to have some sort of pulley apparatus with a bucket attached for hauling dirt or rocks from the construction site. There are two construction...
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Floor of Black Canyon This shows a view looking down into Black (not Boulder) Canyon during early stages of construction of Hoover Dam. The Colorado River is in the process of being diverted and construction equipment and workers can be seen in the foreground.
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Black Canyon A view of the Colorado River flowing through Black (not Boulder) Canyon. On the right side of the canyon there is a road with two automobiles, some construction equipment, and a construction worker.
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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 concrete pouring construction taken from the Arizona side, looking downstream View from donwstream on the Arizona side of the Colorado River of concrete pouring construction on Hoover Dam. Construction workers are seen amid multiple concrete pouring forms and scaffolding. A suspended concrete pouring bucket is seen in the middle...
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Excavation for downstream plug, Diversion Tunnel No. 2. Interior of diversion tunnel no. 2, showing excavation work. Construction workers stand on and below scaffolding to reach the tunnel walls and ceiling. Trucks are seen on the tunnel floor. The site is illuminated by electric lighting. ...
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View of two hundred ton two-way trailer, with test load Several men inspect a two hundred ton two-way trailer loaded with construction materials. The trailer stands next to a railroad track, and in front an industrial building. Mountains can be seen in the background.
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Construction on Hoover Dam, looking downstream on the Colorado River Aerial view of the Hoover Dam construction site. Construction workers are seen amid concrete pouring forms and other construction equipment. Temporary stairs are attached to the wall of Black Canyon, and a railroad bench used for transportation of concrete buckets...
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View looking into power house block A-5. Close-up of scaffolding and construction on one of the power houses in the Hoover Dam construction site. Sections of pipe and other construction equipment can be seen on the ground in the foreground.
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Excavation for bridge abutment in Arizona spillway. Construction workers are seen above concrete pouring forms and scaffolding during construction of the Arizona spillway in Hoover Dam. An electric dragline can be partially seen in the upper left.
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Looking downstream over the top of Hoover Dam Aerial view looking over the top of construction on the face of Hoover Dam. Construction workers can be seen amid concrete pouring forms and other construction equipment. A railroad bench for transportation of concrete can be seen in the lower...
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Interior of penstock tunnel -- Hoover Dam construction site Interior view of number 4 raise and plug showing construction. Construction workers can be seen at the far end of the tunnel.
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Constructing highway to dam site A view of construction workers operating tractors as they construct a highway across the desert floor during the summer of 1931.
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Producing electricity at the construction site This photograph shows 3 construction workers observing electric generators being hauled up the river bank on wooden tracks through the use of pulleys and ropes. The backround of the picture shows the Colorado River flowing though Black Canyon.
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Building Black Canyon Highway to Hoover Dam site This is a view looking at the walls of Black Canyon with the Colorado River flowing below. In the foreground of the picture there is a ledge or trail cut into the side of the mountain and there is a...
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Construction workers at Hoover Dam. This photograph shows workers operating a power shovel to dig dirt and rocks and put them in a truck at the Hoover Dam site. The picture also shows an air compressor.
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Power house under construction - Hoover Dam site Shows partially completed power house at the Hoover Dam site. A construction worker, ladders, cables and building materials such as lumber are visible.
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Section of penstock pipe being lifted by cable Construction workers supervise the lifting of a 30-foot section of penstock pipe from a trailer by a cableway in the Hoover Dam construction site.
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Construction on the no. 4 penstock raise Close-up of framework inside the unfinished opening of a penstock tunnel. Construction workers can be seen in the foreground on what appears to be a transportation track.
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Construction on the four intake towers in Hoover Dam View from the Arizona side of the Hoover Dam construction site of work on the four intake towers. Steel framework rises from the top of each intake tower. Part of the Nevada spillway is seen in the upper right. Construction...
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Looking downstream on the Hoover Dam construction site This view, taken from the Nevada side of the canyon, shows the lower cofferdam being excavated. Trucks, buildings, , and construction roads are visible. The Colorado River can be seen below the site. There is a temporary...
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Top of Hoover Dam, during construction View of Hoover Dam construction from the top of the dam looking toward the Arizona side. A spillway and intake towers are visible in the background. Concrete pouring forms are shown with construction people at work. Hoisting...
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Top of Hoover Dam, during construction View of the top of Hoover Dam during construction with intake towers and a spillway in the background. A temporary bridge and cableway with trams span the canyon. Construction workers are on top of the dam, working with...
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View of Arizona spillway during construction A telephoto view of the Arizona spillway during the construction of Hoover Dam. Shows the bridge and control house. Trucks, various buildings, and some construcion workers are visible. Cables are overhead and construction roads snake up the...
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Switchyard control circuit tunnel under construction -- Hoover Dam site Shows construction work on the switchyard control circuit tunnel. Various structures are visible, as well as roads, and automobiles. A power shovel is excavating. In the foreground is the power sub-station. The Babcock and Wilcox Company...
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View of no. 1 plug showing the arch and raise Shows the concrete pouring forms and the gunited portions of the arch and raise that goes into the Nevada spillway. Also shows construction equipment and construction workers.
 

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