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51 - 75 of 1628 Items << < 1 2 3 4 5 6 7 8 9 10 > >>
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View of construction inside the no. 4 penstock raise. Construction workers stand on the framework and platforms inside the unfinished tunnel.
1934-08-21
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View of construction workers on framework inside the no. 4 penstock tunnel portal during construction of Hoover Dam.
1934-09-27
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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.
1934-07-20
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Shows valve house outlet pipes being uloaded with a cableway. A construction worker is standing on top of a pipe as it is being lifted off a railroad car.
1934-04-27
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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.
1932-03-07
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View of the beginning of Hoover Dam contruction at the bottom of Black Canyon. Various pieces of equipment, trucks, workers, etc. are visible including a crane suspended above the construction site. The view is from downstream.
1933-06-06
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Shows men and trucks working on the cofferdam at the Hoover Dam site. Power shovels and other construction equipment are also visible.
1933-04-20
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Shows construction workers, truck, and power shovel inside a diversion tunnel at the Hoover Dam construction site. Electric lights illuminate the scene.
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View of construction in Black Canyon at the Hoover Dam site. Construction workers are standing by the railroad tracks looking at a dynamite blast that is taking place in the distance. The Colorado River is visible as are various pieces of...
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Shows intake towers on upstream side of dam. Towers are almost completed. Coffer dam is still in place. Construction workers and construction equipment including derrick cranes are visible.
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View of the outlet works spewing water. This photo was taken while the dam was still under construction and shows cables, construction equipment and workers.
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Shows the building forms inside a tunnel at Hoover Dam. The shot is taken from the downstream Nevada adit, looking toward a downstream plug. Several construction workers can be seen.
1935-08-27
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Shows construction workers deep inside a tunnel at the Hoover Dam site. The scene is lit with electric lights and a railroad track is visible.
1935-03-04
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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 machinery is also...
1934-10-17
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Shows partially completed power house at the Hoover Dam site. A construction worker, ladders, cables and building materials such as lumber are visible.
1934-05-29
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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.
2024-04-19
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Construction workers and equipment are seen in a cut-off trench in the upstream side of the Hoover Dam construction site.
1933-06-23
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Photo shows a crane transporting cement mixers pouring the concrete lining in a diversion tunnel for Hoover Dam. Workers and equipment are visible in the interior of the tunnel.
1932-03-23
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Construction workers are operating machinery to finish slabs in the invert lining of a diversion tunnel at the Hoover Dam site.
1932-04-11
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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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Handwritten inscription on back of photo: "View at upper portals showing narrowed channel just prior to diversion". Construction roads, equipment, and workers are visible. Some buildings and trucks are also in the picture.
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Shows a construction worker and power shovel inside a diversion tunnel at the Hoover Dam construction site.
1932-03-07
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Construction on the Arizona power house. A portion of the dam face is seen in the upper left. A construction worker stands on a dump truck in front of the power house and another worker is seen sitting on part of a cableway in the lower center of...
1935-03-26
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General view of the switchyard at Hoover Dam. A power shovel, dump truck, and other construction equipment are visible. Buildings and a few construction workers are also seen.
1935-09-27
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Shows construction men working on an intake tower and bridge. They are lowering the trashracks into their respective slots. Also shows a crane and hoisting machinery. Cables cross overhead.
1935-05-27
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