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Workers on the Colorado River A view of construction workers towing a generator behind the boat that they are using to cross the Colorado River.
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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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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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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 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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Aerial view of construction on the top of Hoover Dam Aerial view of construction on the top of the Hovoer Dam. Construction workers watch as a concrete pouring bucket, seen on the left side of the picture, is hoisted over the site. The Arizona intake towers are visible in the...
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Construction on the Nevada spillway View of construction on the Nevada spillway in Black Canyon. An electric dragline is seen on a trestle in front of the spillway.
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Aerial view of the Hoover Dam construction site viewed from downstream on the Colorado River Aerial view of the Hoover Dam construction site taken from downstream on the Colorado River in Black Canyon. Construction on the Nevada and Arizona power houses is shown in the foreground in the cofferdam. Concrete pouring forms cover the top...
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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 Arizona spillway View of construction on the Arizona spillway in Black Canyon. An electric dragline can be seen at the top left of the dirt road above the spillway. Construction on one of the penstock tunnels can be seen inside the spillway.
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Construction on the no. 4 penstock raise View of construction workers on framework inside the no. 4 penstock tunnel portal during construction of Hoover Dam.
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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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Construction on the Nevada and Arizona power houses in the downstream cofferdam below Hoover Dam View from the downstream cofferdam of the Hoover Dam construction site. Construction workers, temporary buildings, electric draglines, vehicles and other construction equipment are seen in the cofferdam. Framework rises from the tops of the power houses on both sides of...
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Close-up of the Nevada powerhouse, showing the draft tubes. Close-up of construction on the Nevada powerhouse. Construction workers stand amid piles of lumber on the ground. Wood and steel framework is seen at the top of each draft tube in the power house.
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Construction on the Nevada power house viewed from the Arizona valve bench View of construction on the Nevada power house seen from the Arizona valve house bench. Framework rises from the top of the power house. Temporary buildings can be seen in the cofferdam in front of the power house. Part of...
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Construction on the Arizona power house viewed from the Nevada valve house bench View of construction on the Arizona power house seen from the Nevada valve house bench. Framework rises from the top of the power house. Temporary buildings, construction equipment and vehicles can be seen in the cofferdam in front of the...
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Construction on the Arizona spillway and the no. 4 penstock raise in Black Canyon View of construction on the Arizona spillway and the no. 4 penstock raise. Black Canyon surrounds the construction site. An electric dragline and trucks are seen on the dirt road above the spillway.
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Aerial view of the Hoover Dam construction site in Black Canyon showing the upstream dam... Aerial view of the Hoover Dam construction site in Black Canyon showing the upstream dam face, which has concrete pouring forms on the top of it, the Arizona and Nevada spillways, and the unfinished Arizona intake towers. The Colorado Rivers...
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Construction in the no. 4 penstock raise View of construction inside the no. 4 penstock raise. Construction workers stand on the framework and platforms inside the unfinished tunnel.
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Construction inside the upper no. 3 plug Construction inside the upper no. 3 plug showing framework, pipe sections and a pumpcrete used for pumping concrete.
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Construction in the no. 1 penstock raise View of construction work inside the portal of the no. 1 penstock raise. Construction workers can be seen on the framework outside of the portal.
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Construction on the Arizona intake towers View of construction on the Arizona intake towers. Steel framework protrudes from the tops of the towers. A derrick crane is seen above the towers, and the Arizona spillway is visible in the background. Part of the dam face, covered...
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Construction on the Nevada intake towers View of construction on the Nevada intake towers. Steel framework protrudes from the tops of the towers. Concrete pouring buckets can be seen on the rarilroad bench below the towers. Derrick cranes can be seen in the canyon walls above...
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Close-up of formwork in the Arizona power house Construction workers are seen working amid the wood and steel framework during construction of the Arizona power house. Unfinished penstock tunnel portals can be seen in the canyon wall in the background.
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Construction on the Nevada power house View of construction on the Nevada power house. The dam face is seen in the upper right. Unfinished penstock portals are seen in the canyon wall. Temporary buildings and construction equipment are seen in the cofferdam between the Nevada and...
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Construction on the Arizona power house View of construction on the Arizona power house. Wood and steel framework surround the site. Part of the dam face is seen in the upper left. Construction workers, equipment and temporary buildings are seen in the cofferdam between the Nevada...
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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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Nevada intake towers, Hoover Dam construction site View of the Nevada intake towers during construction. The photo was taken from the Arizona side of the canyon and shows suspended temporary bridges, a railroad track and cars on the side of the canyon, a trestle, and...
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Construction view of Hoover Dam, looking downstream A view, looking downstream, of the spillways and intake towers during the construction of the dam. Temporary bridges and cables with trams span the canyon. Various buildings, a trestle, and construction roads can also be seen.
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Hoover Dam during construction View of Hoover Dam during construction, showing the power houses. Various buildings and structures are visible as well as concrete forms and hoisting machinery. There is a cable stretched across the canyon.
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View of the power house and valve houses from top of Hoover Dam View of the power house and valve houses from the top of the dam. Various buildings and structures can be seen as well as concrete forms. There are construction roads below the dam and a temporary bridge spans...
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View of bridge across Hoover Dam during construction View, looking toward Arizona intake tower control house, of construction workers placing concrete forms for pouring on the bridge. There are workers standing on top of the control house, too. A crane can be seen in...
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Upstream face and intake towers of Hoover Dam during construction View taken from the Arizona side showing the intake towers and upstream face of the dam during construction. Various buildings are visible as well as hoisting machinery and a railroad snaking along the upper canyon. Cables span the...
 

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