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151 Object thumbnail
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...
152 Object thumbnail
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.
153 Object thumbnail
Side-wall jumbo inside diversion tunnel View of the interior of a diversion tunnel showing the side-wall jumbo used for placing of the concrete tunnel lining. The tunnel and jumbo are illuminated by electric lights. A construction worker stands in the foreground. A truck...
154 Object thumbnail
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...
155 Object thumbnail
Steel form for diversion tunnel lining being hoisted into Black Canyon A completed section of steel form to be used for the lining of the diversion tunnels is hoisted by a cable into Black Canyon while construction workers supervise.
156 Object thumbnail
Steel form for diversion tunnel lining being hoisted over the Colorado River A completed section of steel form to be used for lining the diversion tunnels is seen being hoisted on a cableway over the Colorado River. A construction worker can be seen standing on top of the form.
157 Object thumbnail
Cape Horn on the Colorado River showing cliff buildings Shows the Six Companies construction camp at Cape Horn on the Colorado River. Shows several buildings on the bank above the river.
158 Object thumbnail
Dam workers return to Boulder City after shift Shows a motor lorry (bus)parked in Boulder City; dam workers are exiting the lorry as they return from the day shift on Hoover Dam. Portions of buildings are visible.
159 Object thumbnail
View of Colorado River This shows the Colorado River from a lookout point above. Two people are faintly visible and as well as part of the road . There are mountains in the background which are covered with water today.
160 Object thumbnail
Truck on road to Hoover Dam site Shows a truck on the road to the Hoover Dam site. There are mountains visible.
161 Object thumbnail
Black Canyon during dam construction Shows construction equipment and buildings in Black Canyon. There is a platform built on the side of the canyon and a cable line overhead transporting trams.
162 Object thumbnail
Bucket skips being filled with "muck" from the deep inner gorge of Black Canyon. Shows construction equipment and workers in the gorge of Black Canyon. Bucket skips are being loaded with muck to be transported out of the canyon. Also shows a power shovel and high scalers.
163 Object thumbnail
Diversion tunnels during Hoover Dam construction Photo shows the Arizona diversion tunnels during the construction of Hoover Dam. Two men, railroad trucks, a temporary bridge, some temporary structures and a cable over the canyon are also shown.
164 Object thumbnail
Hoover Dam area and Colorado River An overview of the Hoover Dam area showing mountains, the Colorado River, and Fortification Hill.
165 Object thumbnail
"Crows Nest" overlooking Black Canyon and the Colorado Two men, possibly surveyors, standing on the edge of the canyon at an overlook known as "Crows Nest", overlooking the Hoover Dam site in Black Canyon. The Colorado River is visible below. Photo is actually a postcard.
166 Object thumbnail
Construction workers at Hoover Dam Two construction workers at the Hoover Dam site working with heavy machinery.
167 Object thumbnail
Workers laying railroad track near Boulder Canyon Photo shows workers and machinery involved in laying railroad track near Boulder Canyon. There are several structures in the picture and mountains in the background.
168 Object thumbnail
Construction crews in Boulder Canyon. Photo shows a power shovel and dump truck doing construction work in Black Canyon (not Boulder Canyon).
169 Object thumbnail
One of the construction sites in Boulder Canyon. Shows construction equipment, a boat, and various structures. Location is a rocky outcrop in Black Canyon (not Boulder Canyon) on the bank of the Colorado River.
170 Object thumbnail
Blasting at Hoover Dam construction site. Shows blasting at the Hoover Dam construction site. A road along the Colorado River and a building on the opposite shore can be seen as well as mountains in the background.
171 Object thumbnail
Highway near Hoover Dam Shows a highway through the mountains near Hoover Dam.
172 Object thumbnail
Diversion tunnels under construction - Hoover Dam Exterior view of diversion tunnels at the Hoover Dam site during construction. Photo shows the Colorado River and scaffolding around the partially constructed tunnels.
173 Object thumbnail
Construction scene at Hoover Dam site Shows construction crew and equipment at the Hoover Dam site. Power lines are also in the scene.
174 Object thumbnail
Construction site at Hoover Dam Photo shows various buildings and structures, railroad tracks, trucks and power lines. There is blasting taking place in the background between the mountains.
175 Object thumbnail
Somewhere near present-day Hoover Dam Shows mountains and sand, somewhere in the vicinity of present-day Hoover Dam.
176 Object thumbnail
Construction work at Hoover Dam site Shows several buildings and structures on a rocky hillside on the bank of the Colorado River. They were involved in the construction of Hoover Dam.
177 Object thumbnail
High scalers preparing anchorages in Black Canyon Three high scalers prepare rope anchorages for future scaling work one thousand feet above the Colorado River in Black Canyon.
178 Object thumbnail
Construction workers with electric light reflectors standing by a truck in Black Canyon Several construction workers in Black Canyon prepare reflectors for electric lighting from metal dishpans. Some of the workers stand in a truck bed and others stand beside the truck.
179 Object thumbnail
Future Hoover Dam reservoir area seen from Black Canyon View from Black Canyon of the area which, when submerged, will become the Hoover Dam reservoir. In the foreground, a car is seen traveling a dirt road, and a lone construction worker views the scene from atop the rocks....
180 Object thumbnail
Blasting on the Arizona side of the cableway bench excavation View from the lower portal of railroad tunnel no. 1 of rock blasting on the Arizona side of Black Canyon. Power poles and power lines are seen lining a dirt road leading to the blasting site. Other cables hang...
181 Object thumbnail
Rock blasting in Black Canyon View from a dirt road of rock blasting in Black Canyon. Electric power poles and lines run along the road and other cables are suspended over the canyon. A truck is seen in the foreground.
182 Object thumbnail
Close-up of rock blasting in Black Canyon, taken from the Black Canyon Highway Close-up of enormous smoke and dust clouds filling Black Canyon during rock blasting for construction of Hoover Dam.
183 Object thumbnail
Rock blasting on the Arizona side of Black Canyon View of Black Canyon and the Colorado River; smoke and dust clouds fill the canyon at the site of rock blasting for the Arizona intake towers. A steel suspension bridge is seen crossing the river upstream.
184 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...
185 Object thumbnail
Detail of side-wall jumbo inside diversion tunnel Detail of a side-wall jumbo used for pouring concrete lining inside a diversion tunnel. The side wings of the jumbo are jacked into place, and concrete is poured through ports by means of a traveling crane and 2 yd....
186 Object thumbnail
Section of a concrete-pouring jumbo standing outside of a diversion tunnel A completed section of a form, or "jumbo," for pouring of concrete to create the diversion tunnel arches stands upon trestles in Black Canyon. Construction workers are seen working on the form.
187 Object thumbnail
Dragline loading gravel into railroad side dump cars View of an electric dragline loading railway side dump cars in the gravel pit in Black Canyon. Mikado type locomotives pull 10-car trains, 3 trains of this type [were] in operation.
188 Object thumbnail
Railroad freight cars carrying gravel across a trestle bridge on the Colorado River A locomotive pulls freight cars loaded with gravel across a trestle bridge on the Colorado River toward the screening plant. A round trip took slightly over two hours.
189 Object thumbnail
Man standing on trestle bridge on the Colorado River pointing at anchoring cables A man stands on the trestle bridge near the gravel pit and points at the cables attached to the upstream face of the bridge used to anchor the bridge in case of high water. Three-inch cables [were] anchored to...
190 Object thumbnail
Locomotives at the gravel plant yard Four standing locomotives are seen on the railway tracks in the gravel plant yard. A freight car can be seen behind one of the locomotives.
191 Object thumbnail
High scalers on the Nevada side of Black Canyon High scalers work on the canyon wall on the Nevada side of Black Canyon, excavating for construction of an intake tower. Bridges can be seen in the distance crossing the Colorado River.
192 Object thumbnail
High scalers on the Nevada side of Black Canyon above the Colorado River Close-up of high scalers working on the Nevada side of Black Canyon, 700 feet above the Colorado River. Two bridges are seen crossing the river below.
193 Object thumbnail
Close-up of construction workers rigging a cableway over the Colorado River Two construction workers are seen rigging a "skip," or platform, to a cableway above the Colorado River in Black Canyon. The skip will be used to cross the river above the canyon.
194 Object thumbnail
Construction workers on cableway transport over the Colorado River Construction workers are seen being transported over the Colorado River in Black Canyon via a "skip," or platform, attached to overhead cableways.
195 Object thumbnail
Closeup of Upper Portal of Diversion Tunnels No. 3 and 4, during preparations for blast. A close-up of the portals to diversion tunnels no. 3 and 4 on the Colorado River. Construction workers prepare equipment for a blast. A truck loaded with lumber can be seen between the tunnels.
196 Object thumbnail
Dumping materials at temporary pile bridge to complete diversion of the Colorado River. Dump trucks dump materials into the Colorado River to from a temporary bridge in order to divert the river into the diversion tunnels. Several construction workers carry out and supervise the operation and a large group watches from the...
197 Object thumbnail
Closeup of Upper Portals of Diversion Tunnels No. 3 and 4, showing flow in Diversion... The Colorado River begins its flow into diversion tunnel no. 4. The portals to both diversion tunnels no. 3 and 4 are seen.
198 Object thumbnail
Dump trucks on temporary dike in front of portals of diversion tunnels no. 3 and... View of the temporary dike created to divert the Colorado River into the diversion tunnels. Dump trucks and construction workers are seen on the temporary pile bridge and the portals of diversion tunnels no. 3 and 4 are seen in...
199 Object thumbnail
Panoramic view of the Upper Cofferdam, looking downstream Panoramic view of construction in the upper cofferdam of Hoover Dam in Black Canyon. A dragline is seen in the middle of the canyon floor. Several trucks, construction equipment and construction workers are also seen in the canyon.
200 Object thumbnail
Aerial view of the Colorado River showing diversion of the river into diversion tunnels no.... Aerial view of the Colorado River in Black Canyon showing the diversion of the river into diversion tunnels no. 3 and 4.
 

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