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51 Object thumbnail
Close-up of workers using a drilling jumbo inside a diversion tunnel Close-up of construction workers using a drilling jumbo to excavate the interior of one of the diversion tunnels. The tunnel is illuminated by floodlight.
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Construction worker in bulldozer in front of diversion tunnel portal A construction worker sits in a Caterpillar bulldozer in front of an unfinished diversion tunnel portal.
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Construction workers using a drilling jumbo inside a diversion tunnel Construction workers using a drilling jumbo to excavate one of the diversion tunnels.
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Invert concrete pouring forms inside diversion tunnel Interior of a diversion tunnel, showing invert concrete pouring forms. Some construction workers can be seen in the foreground. The tunnel is illuminated by electric lights.
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Gantry crane inside diversion tunnel no. 3 A gantry crane is seen inside a diversion tunnel during construction of Hoover Dam. A flat bed truck is seen on the tunnel floor in the foreground and construction workers stand by. The tunnel is illuminated by electric...
56 Object thumbnail
Invert forms inside diversion tunnel no. 3 Interior of diversion tunnel no. 3, showing invert forms used for pouring concrete slabs. A trimming jumbo used for aligning the gauge of the tunnels is seen in the background. The tunnel is illuminated by electric lights.
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Concrete lining inside diversion tunnel no. 3 View of the interior of diversion tunnel no. 3, showing the invert and side wall sections of three-feet thick concrete lining. The tunnel is illuminated by electric lights. Two construction workers stand inside the tunnel.
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Concrete lining inside diversion tunnel no. 2 View of the interior of diversion tunnel no. 2, showing the completed invert and side wall sections of concrete lining. The tunnel is illuminated by electric lights. On the tunnel floor, construction workers stand by a truck which is...
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Concrete side wall lining in diversion tunnel no. 3 View of the interior of diversion tunnel no. 3, showing completed side wall sections of concrete lining. The tunnel is illuminated by electric lights. Concrete pouring forms and a gantry crane are seen in the rear of the tunnel.
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Construction of steel forms for the lining of the diversion tunnels View of outdoor construction of steel forms to be used for lining the arch sections of the diversion tunnels. Construction workers are seen, one of them operating a bulldozer. A power shovel can be seen behind the steel...
61 Object thumbnail
Detail of a sidewall jumbo inside diversion tunnel no. 3 Close-up of a section of a side-wall jumbo inside a diversion tunnel set for concrete pouring of the tunnel's side walls. The form is 80 feet long and consists of four 20-foot sections bolted together. Measurements are marked...
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Interior of spillway tunnel, Hoover Dam site Shows concreting equipment inside No. 1 spillway tunnel during the construction of Hoover Dam.
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Interior of diversion tunnel during Hoover Dam construction View of interior of diversion tunnel No. 3 during the construction of Hoover Dam.
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Forms for transition at the downstream plug of Diversion Tunnel No. 2. Interior of diversion tunnel no. 2, illuminated by electric lights, showing construction workers with concrete pouring forms. The tunnel walls are partially finished.
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Excavation for downstream plug, Diversion Tunnel No. 2. Interior of diversion tunnel no. 2, showing excavation work. Construction workers stand on and below scaffolding to reach the tunnel walls and ceiling. Trucks are seen on the tunnel floor. The site is illuminated by electric lighting. ...
66 Object thumbnail
Excavation for downstream plug, Diversion Tunnel No. 3. Construction workers are seen excavating the interior of diversion tunnel no. 3. The tunnel is illuminated by electric floodlights. Construction equipment is seen on the tunnel floor.
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Aerial view of 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. Concrete pouring forms are seen around the dam wall in the center of the picture. Buildings, vehicles and roads are seen in the river...
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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...
69 Object thumbnail
View of railroad tracks being laid at Hoover Dam site. A view of railroad tracks on the side of the mountain leading into a tunnel in the background. Both walls of the canyon are visable and the Colorado River is flowing through the bottom of the canyon. In the foreground...
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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 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 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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Switchyard control circuit tunnel under construction -- Hoover Dam site Shows construction work on the switchyard control circuit tunnel. Various structures are visible, as well as roads, and automobiles. A power shovel is excavating. In the foreground is the power sub-station. The Babcock and Wilcox Company...
76 Object thumbnail
Construction at Hoover Dam, inside a tunnel 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.
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Construction of the Arizona power house Shows the reinforcing framework for the Arizona power house and the locations for the turbine rooms, front room galleries, and penstocks. Some buildings, trucks, tunnel openings, and construction workers are visible.
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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.
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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.
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Looking downstream into no. 4 raise, showing close-up of portal forms. Shows concrete pouring forms for the portal of no. 4 raise.
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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.
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Number 3 plug and raise Number three plug and raise with the plug concrete in place. Also shows construction equipment.
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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.
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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.
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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.
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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.
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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.
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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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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.
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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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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...
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Night view of the diversion tunnels Night view looking upstream. A spectacular sight with its myriads of lights. Shows lighted bridges across the canyon above the Colorado River.
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Road tunnel portal View of the Nevada side of the Hoover Dam construction site, showing a road tunnel portal in the wall of Black Canyon on the left. The dam face and construction on the Nevada power house can be seen in the...
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Looking upstream toward no. 1 upstream plug, showing approximately 7,100 second feet of water being... View of water being discharged into the no. 1 diversion tunnel. A series of bundled pipes is visible on the right side of the tunnel wall.
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Crew working at Hoover Dam site This is a view of construction workers working on a tunnel at the Hoover Dam site. There are two construction workers standing to the side of a track leading from a tunnel in the side of the mountain. There is...
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Diversion tunnel under construction - Hoover Dam Exterior view of diversion tunnel at the Hoover Dam site during construction. Photo shows the Colorado River flowing through the tunnel and scaffolding around the partially constructed tunnel.
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Digging diversion tunnels at Hoover Dam. Construction workers digging diversion tunnels using construction equipment.
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Construction in Black Canyon A view of the construction on the walls of Black (not Boulder)Canyon. There appears to be several tunnels dug into the canyon walls. Construction workers are standing on scaffolding in the left foreground of the picture. A track constructed of...
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Hoover Dam -- downstream face Color transparency of the downstream face of Hoover Dam. This panoramic view shows the portals of the diversion tunnels, the power house, the walls of Black Canyon, and the Colorado River.
100 Object thumbnail
View of Hoover Dam from downstream on the Colorado River View of Hoover Dam from downstream on the Colorado River. The Nevada power house is vivisble on the left, and water is being discharged from the outlet works of the Arizona valve house on the right. The diversion tunnel portals...
 

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