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Construction on the Nevada spillway weir View of construction on the Nevada spillway weir. Scaffolding, concrete pouring forms and other construction equipment are seen at the site.
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Construction of the Arizona power house foundations View of construction of the foundations of the Arizona power house in the Colorado River bed in Black Canyon. Concrete pouring forms stand in the river bed and other construction equipment can be seen. Construction workers can be seen at...
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Construction on the foundation of the Arizona power house View of construction on the foundations of the Arizona power house in the Colorado River bed in Black Canyon. Concrete pouring forms stand in the river bed below the partially finished face of Hoover Dam, and other construction equipment can...
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Forms for Arizona power house retaining wall. Close-up of the concrete pouring forms for the Arizona power house retaining wall. Some concrete has already been poured. Temporary buildings, construction workers and vehicles can be seen in the background at the foot of the Hoover Dam face.
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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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Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. Concrete pouring forms and other construction equipment are seen on the partially finished dam face and in the river bed below it. Unfinished...
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Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. Concrete pouring forms and other construction equipment are seen on the partially finished dam face and in the river bed below it. The...
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Himix concrete mixing plant View of the Himix concrete mixing plant building and silos at the Hoover Dam construction site. The railroad bench for transportation of buckets of concrete can be seen on the wall of Black Canyon above the plant. The corner of...
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Concrete pouring forms inside lower no. 2 plug Interior of lower no. 2 plug, illuminated by electric lighting. Concrete pouring forms for an arch and walls are seen. Other construction equipment is seen on the tunnel floor. A "700" is marked on the rock near the roof...
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Closeup of cooling pipe layout in panel H-3. Close-up of construction workers setting up concrete cooling pipes in the Hoover Dam construction site.
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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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Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River Aerial view of Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. A cooling tower is seen in the foreground. The partially finished dam face is covered with concrete pouring forms and other construction equipment....
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Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River Aerial view of the Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. The partially finished dam face is covered with concrete pouring forms and other construction equipment. Unfinished penstock openings are seen in the canyon...
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Construction on the Nevada intake towers View from the Arizona side of the Hoover Dam construction site of work on the foundations of the Nevada intake towers in the wall of Black Canyon. A railroad bench for delivering concrete is seen near the bottom, in...
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Construction on the Arizona intake towers and spillway View of construction on the foundations of the Arizona intake towers and on the Arizona spillway in Black Canyon. The partially finished face of Hoover Dam is seen in the lower right.
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Construction on the Nevada power house View of the Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. The partially finished dam face can be seen on the right, with concrete pouring forms and other construction equipment. Construction of the Nevada power...
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Construction on the Arizona power house View of the Hoover Dam construction site, looking upstream on the Colorado River in Black Canyon. The partially finished dam face can be seen on the left, with concrete pouring forms and other construction equipment. Construction of the Arizona power...
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Construction on the power house footings View of the Hoover Dam construction site looking upstream on the Colorado River in Black Canyon. The partially finished dam face is covered with concrete pouring forms and other construction equipment. Vehicles and temporary buildings are seen in the river...
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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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Union Pacific "Train of Tomorrow" -- Hoover Dam site Shows the "Train of Tomorrow" at the upstream face of Hoover Dam, where concrete is transferred from trains to the dam. Hoisting machinery, high scaling equipment, and train trestle can be seen. There is a group of people...
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Nevada spillway during construction of Hoover Dam Shows the Nevada spillway in the background. Taken from the Arizona side of the dam, this view shows a temporary stairway, cables, hoisting machinery and other construction equipment.
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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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Intake towers and spillway -- Hoover Dam construction View of the intake towers and the spillway on the Arizona side of the dam during construction. Hoisting equipment, concrete forms, and high scaling equipment can be seen.
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Nevada intake towers under construction Shows the Nevada intake towers during construction. Taken from the Arizona side of the Hoover Dam site, hoisting equipment, a train trestle, a temporary stariway up the side of the canyon and concrete forms are visible. In the...
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Hoover Dam intake towers during construction Shows Hoover DAm and the Nevada intake towers during construction. Temporary stairways, train trestle, concrete forms, hoisting machinery and other construction equipment can be seen. "Monkey slide" spans the canyon and can be seen in the center...
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Unloading huge pipes -- Hoover Dam site 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.
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Aerial photo of Hoover Dam construction site This aerial photo shows various parts of the dam under construction. Cableways, an overhead tram, various buildings and structures, railroad tracks, trestles, and concrete forms are visible. Also shows the Arizona spillway, Arizona intake towers, the Himix plant...
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Train at Himix Concrete Plant -- Hoover Dam site View of a train carrying cars loaded with sand. The train trestle is visible as well as the bins at Himix Concrete Plant where rock and sand are dumped.
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View of a power house at the Hoover Dam construction site Shows the Nevada power house under construction at the dam site. Various buildings, concrete forms, and the wall of the rising dam can be seen. Behind the dam, part of an intake tower is visible as well...
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Nevada power house at Hoover Dam construction site View of construction of the Arizona power house at the dam site. Hoisting equipment, cables, trucks and construction workers can be seen. Various buildings and structures are pictured as well as roads and concrete pouring forms.
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Downsteam view of Hoover Dam, showing power house construction View of Hoover Dam and power house under construction. Buildings and structures, concrete pouring forms, cables, and a crane can be seen. Some construction workers and trucks are also pictured. Above the dam part of an intake...
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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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Intake towers being constructed for Hoover Dam View of construction of the Arizona intake towers from the Nevada side of Black Canyon. Part of the dam is visible in the lower right corner. High scaling equipment, temporary bridges, hoisting equipment and cables can be seen.
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Nevada intake towers under construction at Hoover Dam Shows the construction of the Nevada intake towers, taken from the Arizona side of the canyon. Trestles, cables, hosting equipment and temprary bridges are visible. Below the towers there is a temporary railroad.
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Interior view of a power house -- Hoover Dam construction site Shows interior of a power house under construction. A construction worker is visible between the reinforcing steel and pipes.
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View of power houses being constructed at the Hoover Dam site General view of the construction of Hoover Dam, looking upstream. The power houses are being built in this phase. A cableway spans the canyon carrying a tram across. There are several buildings, construction workers, and trucks visible....
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Power house under construction at Hoover Dam site Close-up view of a power house under construction at Hoover Dam. Shows concrete pouring forms and the pouring arrangement. There is a construction building and a construction worker in the lower left corner.
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Himix and cement blending plants -- Hoover Dam site General view of the Himix and cement blending plants. A train and aggregate bins are visible above on the side of the canyon.
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Aerial view of the Hoover Dam construction site looking upstream on the Colorado River Aerial view of the Hoover Dam construction site in Black Canyon. Construction on the intake towers is seen in the canyon walls behind the dam face and construction on the power houses is seen in the river bed in the...
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Aerial view of the Hoover Dam construction site looking downstream from the Arizona side Aerial view of the Hoover Dam construction site, looking downstream on the Colorado River in Black Canyon. Construction on the intake towers on both sides of the dam face is shown. The top of the dam face is covered with...
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Close-up of no. 3 Arizona intake tower, showing the cylinder gates being placed. Close-up of construction on the no. 3 Arizona intake tower. Steel framework and rods protrude from the top of the tower.
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Close-up of the Arizona intake towers, from the high catwalk. Close-up of construction on the Arizona intake towers.
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Hoover Dam construction site viewed from the downstream cofferdam View of the Hoover Dam construction site in Black Canyon from the downstream cofferdam. Construction on one of the Nevada intake towers can be seen behind the concrete dam face. Framework and concrete pouring forms are seen on construction on...
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Construction on the Nevada power house View of construction on the Nevada power house. Framework and concrete pouring forms cover the site. Penstock tunnel openings are visible in the canyon wall in the background. Construction equipment, vehicles, temporary buildings and construction workers are seen on the...
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Construction on the Nevada power house in the downstream cofferdam View of construction on the Nevada power house in the downstream cofferdam in the Hoover Dam construction site. Framework and concrete pouring forms cover the powerhouse site. Unfinished penstock tunnel openings are seen in the bottom of the canyon wall...
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Construction on the Arizona power house View of construction on the Arizona power house. Framework and concrete pouring forms cover the powerhouse site. The dam face is seen in the background. Construction workers and equipment, vehicles and temporary buildings are seen in the downstream cofferdam.
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Construction on the Arizona spillway Close-up of the partially-completed construction on the Arizona spillway.
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Construction on the Nevada spillway View of construction on and around the partially-completed Nevada spillway. Construction workers can be seen working on the cylinder gates in the middle of the spillway. An electric dragline is seen on a trestle near the bottom of the spillway.
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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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Commemoration of the pouring of the second millionth cubic yard of concrete in Hoover Dam Hoover Dam construction workers observe as Six Companies officials stand in the construction site by a concrete pouring bucket which bears a sign reading: "United States Dept. of Interior, Bureau of Reclamation, Boulder Canyon Project. Pouring 2nd millionth cu. yd....
 

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