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451 Object thumbnail
Valve house during Hoover Dam construction Shows the Nevada valve house during construction. It is built into the side of the canyon wall. Below it is the refrigeration plant. Cables, a truck, buildings, and scaffolding can be seen.
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Interior of valve house, Hoover Dam construction Shows the interior of a valve house. Note three gates and needle valves have been installed.
453 Object thumbnail
View of Hoover Dam construction from the top of the dam Shows Hoover Dam construction from the top of the dam looking down. The power house, valve houses, and lower portals of the diversion tunnels are visible. Various buildings and trucks are also shown. The Colorado River is...
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Hoover Dam under construction View from the bottom of the canyon looking upstream at the dam and the power house. Trucks, lumber, and a cable spanning the canyon are visible. Pieces of lumber are piled around the site.
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Interior of diversion tunnel during Hoover Dam construction Interior view of a diversion tunnel, showing the water conduit being placed. Scaffolding is visible and the area is lit with electric lighting.
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Switchyard at Hoover Dam during construction View of excavation and construction at the Hoover Dam switchyard. Note the Boulder Dam highway in the back (now U.S. 93). Power shovels, trucks, and buildings are visible, with the mountains in the background.
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Interior of Hoover Dam diversion tunnel during construction Shows the interior of a diversion tunnel at Hoover Dam during its construction. A construction worker and equipment can be seen. Note the cleanup operations, getting ready for the carpenters.
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Panorama looking downstream showing dam, spillways, intake towers and cableways Two photographs mounted together show panoramic view of the constructon of the Hoover Dam. Nevada spillways on the right. Toward the left is a temporary bridge across the canyon, a Nevada intake tower being constructed, the upstream face...
459 Object thumbnail
Arizona spillway, looking upstream. View from canyon rim looking upstream through the Arizona spillway. Scaffolding is in the foreground in preparation of building the bridge over the spillway. To the left are the spillway gates with a crane extending behind.
460 Object thumbnail
Trash rack at the upper portals of diversion tunnnel no. 2. Center of the photo shows diversion tunnel no. 2 with the curved trashrack barricade being constructed in front. Rebar extends up from the concrete barricades. A train trestle runs across the photo, above the diversion tunnel. Cables can...
461 Object thumbnail
Boulder Dam, Hoover Dam looking upstream from the Nevada side. Upstream view of the dam showing the downstream face with multiple catwalks across it. Foreground shows the lower cofferdam with the power houses under construction and a headquarters building. To the right are unfinished Arizona intake towers and...
462 Object thumbnail
Looking upstream toward the upper plug and raise, in diversion tunnel no. 3. View through diversion tunnel no. 3 showing concrete plug poured to close the tunnel. On the upper left another tunnel angles into the main tunnel. Mud and debris coat the tunnels.
463 Object thumbnail
Hoover Dam during construction View looking upstream toward Hoover Dam. Alos shows the entrance to a tunnel and the powerhouses under construction. Trucks, cables, a cableway with trams, and other construction equipment can be seen.
464 Object thumbnail
Power house during construction -- Hoover Dam View of the power house from the top of Hoover Dam, looking down. The valve houses are visible on the sides of the canyon. Roads, trucks, buildings, and the concrete pouring forms can also be seen.
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President Roosevelt dedicating Hoover Dam President Franklin D. Roosevelt is speaking at the dedication of Hoover Dam. Some members of the audience are visible behind him.
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Nevada intake towers -- Hoover Dam site Shows the intake towers after completion. Note the concrete shingle arrangment. Shows the Colorado River below the towers.
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Interior of diversion tunnel during Hoover Dam construction Shows the interior of a diversion tunnel during construction. Construction materials are visible.
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View of switchyard at Hoover Dam site 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.
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Hoover Dam during construction Upstream view of Hoover Dam construction. Buildings, trucks, and roads are visible. Trams are crossing the canyon on a cableway suspended above the dam.
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View of power house from above -- Hoover Dam site Shows the power house and valve houses in a photo taken from the top of Hoover Dam. Buildings and concrete pouring forms are visible.
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Hoover Dam from the Arizona side View of Hoover Dam, taken from the Arizona side, showing the intake towers and reservoir (Lake Mead) above the dam. A power shovel and also some buildings are visible. In the background there is construction equipment in the...
472 Object thumbnail
Looking upstream toward Lake Mead View of Lake Mead. A bus is parked in a turn-out along the lake road.
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Spillway during Hoover Dam construction View of the Nevada spillway drainage flume and general area. Mountains are visible in the background.
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Hoover Dam construction -- spillway View looking toward the Arizona spillway while it is under construction. Note the excavation for the float well supply line. Power shovels are visible.
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View of construction on roads around the Arizona spillway View of construction on roads around the completed Arizona spillway, looking downstream on the Colorado River in Black Canyon. Curbs and guard rails are being installed. A dragline, two dump trucks and a temporary building are seen near the spillway....
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Upstream view of the completed Nevada spillway drainage flume and surrounding area in Black Canyon Upstream view of the completed Nevada spillway drainage flume and surrounding area in Black Canyon.
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Looking upstream from the Arizona spillway gate house towards construction on the upstream abatement wall View looking upstream from the Arizona spillway gate house towards construction on the upstream abatement wall in Black Canyon. An electric dragline is seen on the right behind the spillway. Concrete pouring forms are visible on the abatement wall...
478 Object thumbnail
View of Hoover Dam from the Nevada side, showing the dam, the intake towers, spillways,... View of Hoover Dam upon completion, taken from the Nevada side of the Colorado River in Black Canyon. Visible are the dam face, the four intake towers, the two spillways and various roadways in the canyon and on top of...
479 Object thumbnail
Interior of the Nevada valve house Interior view of the Nevada valve house. Construction scaffolding surrounds the installation of the needle valves and gates. Two construction workers can be seen in the rear at an unfinished opening to the valve house.
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Steel rails on the roof of the Nevada valve house awaiting concrete pouring View of steel rails on the roof of the Nevada valve house, ready for pouring concrete slab. Two construction workers are seen in the distance near the canyon wall.
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Looking into the Arizona spillway raise. View of construction inside the Arizona spillway raise. A concrete-pouring jumbo on tracks is being used for grouting. Other concrete pouring forms can be seen on the interior spillway walls.
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Arizona spillway bridge under construction View of construction on the bridge above the Arizona spillway. Concrete pouring forms are in place and an electric dragline sits above the spillway on the top left. The walls of Black Canyon are seen in the background.
483 Object thumbnail
Construction on the Nevada spillway A construction worker stands in front of a fence above the Nevada spillway. Construction on one of the intake towers can be seen in the upper left. Concrete pouring forms, other construction equipment and temporary buildings can be seen in...
484 Object thumbnail
Overhead view of construction on the Arizona valve house Overhead view from a cableway of concrete pouring forms during construction of the Arizona valve house. A power shovel and several trucks can be seen in the cofferdam at the right.
485 Object thumbnail
View of the Hoover Dam costruction site from the lower cofferdam View of the Hoover Dam construction site, looking upstream from the lower cofferdam. The nearly-completed dam face is seen in the background, and cars and trucks are seen on dirt roads in the cofferdam. Scaffolding and concrete pouring forms are...
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Construction on the Nevada power house View of construction on the Nevada power house from the downstream cofferdam. Concrete pouring forms and steel framework stand on top of the power house foundation. The dam face can be seen in the upper right. Temporary buildings, construction...
487 Object thumbnail
Construction on the Arizona power house View from the downstream cofferdam of construction on the Arizona power house. Concrete pouring forms and steel framework stand on top of the power house foundation. The dam face and wall of Black Canyon can be seen in the background....
488 Object thumbnail
Diversion tunnel no. 1 trashrack and counterweight assembly just prior to the diverting of the... Construction workers are seen climbing on the outside of the no. 1 trash rack at diversion tunnel no. 1. Other workers view the scene from a railroad trestle that runs over the diversion tunnel portal, and from the upper cofferdam...
489 Object thumbnail
Diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion... View of the diversion of the Colorado River into diversion tunnel no. 1 as the gate on diversion tunnel no. 4 is being lowered (on the left). A line of construction workers can be seen standing on the bank of...
490 Object thumbnail
Outlet works -- Hoover Dam Shows a man sitting on top of his car and watching the discharge of water from Hoover Dam outlet works.
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Outlet works -- Hoover Dam Shows a man standing on the ledge across from the entrance to a diversion tunnel at Hoove Dam. Above him water is being discharged from the outlet works on the canyon wall.
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Outlet works -- Hoover Dam -- night view Night view of Hoover Dam with water discharging from the outlet works.
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Construction -- Hoover Dam outlet works Night view of water spewing from the outlet works at Hoover Dam.
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Intake towers -- Hoover Dam Close-up view of intake towers at Hoover Dam with the reservoir (Lake Mead) behind them.
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Night construction -- intake tower at Hoover Dam Night view of the construction of an intake tower at Hoover Dam. Electric lights illuminate the scene and hoisting machinery is visible.
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Hoover Dam during construction View of the upstream side of the dam and the intake towers. In the background mountains and construction roads are visible. Lake Mead (reservoir) is visible above the dam.
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Hoover Dam spillways Color transparency showing the finished Hoover Dam spillways up close, with mountains and power lines in the background.
498 Object thumbnail
Hoover Dam -- at night Color transparency showing Hoover Dam just after dusk. The dam is illuminated with electric lighting and the tops of the intake towers are visible. The lights are reflected in the waters of the reservoir (Lake Mead).
499 Object thumbnail
Hoover Dam -- interior Color transparency showing generators in the interior of Hoover Dam. A man standing next to a generator gives perspective to the size of the generator.
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Construction of Hoover Dam intake towers View of the construction of the intake towers at Hoover Dam, looking up from the floor of the canyon. The face of the dam is visible at left and hoisting machinery can be seen next to the towers.
 

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