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401 Object thumbnail
Upper portal trashrack for diversion tunnel no. 1, on the Nevada side. Shows the concrete pouring forms for the upper portal trashrack for diversion tunnel no. 1 on the Nevada side.
402 Object thumbnail
Diversion tunnel no. 2, showing the pumpcrete line to the upstream plug Shows the concrete pipe line from the pumpcrete gun to the upstream plug in diversion tunnel no. 2. Some construction workers are visible.
403 Object thumbnail
Looking downstream into no. 4 raise, showing close-up of portal forms. Shows concrete pouring forms for the portal of no. 4 raise.
404 Object thumbnail
Looking downstream into the Nevada spillway. Shows construction on the spillway on the Nevada side. Shows derrick cranes, cables overhead, part of the dam, and the intake towers under construction.
405 Object thumbnail
Hoover Dam, looking upstream from Lookout Point Shows the face of the dam with construction going on on the intake towers and the power houses. Also shows cableways and mountains behind dam.
406 Object thumbnail
Third millionth cubic yard of concrete being lowered to Boulder Dam A concrete pouring bucket lowers the third millionth yard of concrete used in the construction of Hoover Dam. Cableways, the intake towers under construction, mountains, and construction workers are also visible.
407 Object thumbnail
Looking upstream through penstock tunnel no. 5 Taken inside penstock tunnel no. 5, perspective to the left shows upstream view through the tunnel. Foreground shows manway tunnel angling down and to the right.
408 Object thumbnail
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.
409 Object thumbnail
Number 3 plug and raise Number three plug and raise with the plug concrete in place. Also shows construction equipment.
410 Object thumbnail
Looking upstream in Black Canyon, showing the downstream face of Boulder Dam. Aerial view of the dam under construction looking upstream from the Nevada side. Concrete pouring forms and scaffolding show along the face of the dam. Power houses under construction can be seen at the foot of the dam....
411 Object thumbnail
View showing installaion of 100-ft. drum gates in the Arizona spillway. Right side of image shows three drum gates in varying stages of installation. Foreground gate is the most complete. Cable way can be seen across the top. Concrete forms are on the left.
412 Object thumbnail
View of the Nevada intake towers, taken from the Arizona side. View of two intake towers under construction. Left tower is further along than right. To far left can see temporary stairway going up the side of the canyon. In left foreground can see pouring forms for the...
413 Object thumbnail
Arizona intake towers and spillway Center of image shows two Arizona intake towers under construction. Right hand tower is more complete than left hand tower, which is just beginning to take shape. A crane is positioned above and between the towers. In right...
414 Object thumbnail
Hoover Dam valve house under construction Shows the Arizona valve house being built. Construction equipment, buildings, cables and high scaling equipment are visible on the side of the canyon.
415 Object thumbnail
Hoover Dam valve house under construction Shows the Nevada valve house being built at the Hoover Dam site. Note the forms for the roof beams being built. Buildings, construction equipment, bridges, and cables are visible.
416 Object thumbnail
Hoover Dam power house under construction Shows a power house at Hoover Dam being built. Note the Universal crane on top. The girder on the flat car has just been lowered by means of the government cableway. This photo was taken from the Nevada...
417 Object thumbnail
View of no. 4 plug, Hoover Dam site Shows work on the no. 4 plug inside a diversion tunnel at the Hoover Dam site. Electric lights illuminate the scene and construction equipment is visible. It shows the method of pouring concrete.
418 Object thumbnail
Interior of power house gallery, Hoover Dam site Shows the interior of the power house governor gallery. It is illuminated with electric lighting and pieces of lumber are lying on the floor.
419 Object thumbnail
Interior of power house turbine gallery, Hoover Dam site Shows the interior of a power house turbine gallery during the construction of Hoover Dam.
420 Object thumbnail
Interior of power house gallery, Hoover Dam site Shows the interior of a power house pump gallery being constructed at Hoover Dam. Shows wiring and electric lights.
421 Object thumbnail
Interior of power house gallery, Hoover Dam site Shows the interior of a power house cable gallery during the construction of Hoover Dam. It is illuminated with electric lighting.
422 Object thumbnail
Interior of valve house during Hoover Dam construction Interior view of a a valve house under construction at Hoover Dam. An emergency gate is being installed. Construction materials are lying on the floor.
423 Object thumbnail
Nevada valve house roof, looking upstream. View of the roof of the Nevada valve house during construction. Note the low strength pedestals and the double layer of railroad iron being placed. The face of the dam can be seen in the background at the...
424 Object thumbnail
Switchyard control house, yard and present substation -- Hoover Dam site Shows the switchyard control house, yard and substation. Workers, trucks, construction equipment and roads are visible.
425 Object thumbnail
View of lower portal during Hoover Dam construction Shows the cleanup of the Arizona side of the lower portals. Buildings and trucks are visible. The portal juts out from the side of the canyon.
426 Object thumbnail
Cleanup site at lower portal of Hoover Dam Shows the cleanup work being done at the lower portal on the Nevada side of the canyon. A power shovel with men aboard is visible. Also cables and other equipment can be seen. The portal is jutting...
427 Object thumbnail
Construction view of the valve house and portal area of Hoover Dam Shows the Nevada construction adits, valve house and plug adit portal. Note the absence of the compressor plant. The beginning of the upstream of the lower portal road tunnel is visible. Buildings and structures, roads, and cables are...
428 Object thumbnail
View inside a tunnel at Hoover Dam site 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.
429 Object thumbnail
Looking upstream at Hoover Dam during construction An expansive view of the upstream face of Hoover Dam during construction. Various buildings and structures, workers, cars and equipment can be seen. Hoisting machinery and concrete pouring forms can be seen also.
430 Object thumbnail
View from the top of Hoover Dam during construction View looking down from the top of Hoover Dam during construction. It shows the power houes, the valve houses and the lower cofferdam. Cars and trucks, buildings and structures, roads, and various equipment can be seen. A cable...
431 Object thumbnail
Arizona intake towers, from the Nevada side View of the Arizona intake towers during construction. They are on the side of the canyon and the Colorado River is visible below. Above and behind the towers a cableway is suspended and other equipment can also be...
432 Object thumbnail
Nevada intake towers, from the Arizona side. Shows the Nevada intake towers at Hoover Dam under construction. Hoisting equipment and cables are visible. At the left of the photo is the face of Hoover Dam. Some buildings and structures are visible at the base...
433 Object thumbnail
Downstream view of Hoover Dam construction Shows a downstream view of the Hoover Dam project from the crest of the dam. Power house and lower portals of diversion tunnels are seen. Buildings and structures, trucks and roads are visible also.
434 Object thumbnail
Panoramic view of Hoover Dam and area during construction Panoramic view of Black Canyon and Hoover Dam during construction. A man is standing on the mountain, looking toward the scene. Note the reservoir (Lake Mead) and Fortification Hill in the background. The portals of the diversion...
435 Object thumbnail
View from the reservoir, looking downstream at Hoover Dam View,looking downstream, of Hoover Dam and the intake towers. There is a boat on Lake Mead (the reservoir).
436 Object thumbnail
Hoover Dam switchyard during construction Shows the Hoover Dam switchyard during construction and excavation. Buildings, roads, and building materials are visible. Trucks and a power shovel are also shown.
437 Object thumbnail
Top of Hoover Dam during construction Shows the road approaching Hoover Dam from the Nevada side and the top of the dam during construction. Note the rubble wall being built and excavation for tower footings. Trucks, hoisting machinery, and cables with trams are visible....
438 Object thumbnail
Construction inside tunnel, Hoover Dam site Shows construction looking upstream in a tunnel at Hoover Dam. One of the pipe sections is in place. Scaffolding and other building materials are shown.
439 Object thumbnail
Interior of diversion tunnel showing pipe Shows the pipe inside a diversion tunnel at Hoover Dam during construction. Electric lights illluminate the scene. Building materials are visible.
440 Object thumbnail
Hoover Dam during construction Shows the upstream side of Hoover Dam during construction. Cableways with trams span the canyon. Intake towers and power houses are visible along with other buildings and structures.
441 Object thumbnail
Top of Hoover Dam during construction Shows the top of Hoover Dam during construction. Construction workers as well as hoisting machinery and other types of equipment are visible atop the dam . Shows the start of utility and elvator towers.
442 Object thumbnail
View taken from the side -- Hoover Dam construction Looking across Hoover Dam from the Arizona side, showing elevator and utility towers under construction. Buildings and structures are visible on the side of the canyon.
443 Object thumbnail
Looking downstream at Hoover Dam under construction View of Hoover Dam during construction. The view was taken from high above, looking downstream, and shows the intake towers, roads, buildings and structures, a cable across the dam, and the reservoir (later known as Lake Mead).
444 Object thumbnail
View of spillway bridge under construction -- Hoover Dam Shows the Arizona spillway bridge under construction. Concreting machinery and scaffolding are shown.
445 Object thumbnail
View of spillway during construction of Hoover Dam Taken from high up, this photo shows the Arizona spillway, highway bridge, and Arizona highway. Mountains and roads can be seen in the background. Buildings, cables, and various types of construction equipment are shown.
446 Object thumbnail
Spillway and Hoover Dam during construction Shows the Nevada spillway and the face of the dam in the background. Cars are visible on the road across the top of the dam. Some of the intake towers are also visible. Construction equipment, buildings, and...
447 Object thumbnail
View of switchyard during construction of Hoover Dam Shows the switchyard, rigging loft, and surrounding area near Hoover Dam. The mountains are in the background and roads, buildings, and construction equipment are visible.
448 Object thumbnail
Interior of tunnel during Hoover Dam construction View of downstream plug, from the Nevada plug adit. Note the forms for the first pour being built.
449 Object thumbnail
Hoover Dam during construction View looking upstream of the dam and power house. Cables with trams and temporary bridges span the canyon. Trucks, roads, buildings and construction equipment can be seen.
450 Object thumbnail
Looking across the top of Hoover Dam during construction View from above of the dam, showing the road across the top. Intake towers are visible also. Cars are on the road across the top of the dam.
 

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