Search for all of "Tunnels", all of "Construction Workers", all of "Construction Equipment"

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	Title	Description
1	Construction near the upper portals of diversion tunnels no. 1 and no. 2	High scalers work on the cliff face above the unfinished portals of diversion tunnels no. 1 and no. 2. Construction equipment, trucks and workers are seen on the road in front of the tunnels. Rigging and ropes hang from...
2	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...
3	View of the concrete lining in the diversion tunnels	Construction workers are pouring concrete to line the diversion tunnels. Lights illuminate the project. Huge buckets hang from a crane.
4	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...
5	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.
6	Hoover Dam construcion -- blasting	Shows the construction of Hoover Dam. One of the portals of the diversion tunnels is visible. Dynamite blasting is taking place in the canyon and trucks and various construction buildings are visible on the cofferdam. Also shows some...
7	Workers in diversion tunnels -- Hoover Dam site	Shows construction workers, truck, and power shovel inside a diversion tunnel at the Hoover Dam construction site. Electric lights illuminate the scene.
8	Close-up of trimming jumbo	Shows construction workers on the trimming jumbo which was used to scale the walls of the diversion tunnels and remove projecting rock. The tunnel is at the Hoover Dam construction site.
9	Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam.	Construction workers using construction equipment to drill railroad tunnels.
10	Six Companies' power shovel dumping dirt in dump truck in diversion tunnel at Hoover Dam...	Construction workers are operating a power shovel, dumping dirt into a dump truck in a diversion tunnel at Hoover Dam. This is in the early phase of dam construction.
11	Crane transporting mixers in diversion tunnel at Hoover Dam site	Photo shows a crane transporting cement mixers pouring the concrete lining in a diversion tunnel for Hoover Dam. Workers and equipment are visible in the interior of the tunnel.
12	Trash rack structure being installed in front of diversion tunnel no. 2	Close-up of construction workers installing the foundations of a trash rack in front of the portal of diversion tunnel no. 2. This is where the first pay concrete was poured.
13	Workers and drilling jumbo inside diversion tunnel no. 4	Construction workers are seen working with a drilling jumbo inside diverson tunnel no. 4.
14	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.
15	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.
16	Construction workers using a drilling jumbo inside a diversion tunnel	Construction workers using a drilling jumbo to excavate one of the diversion tunnels.
17	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.
18	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...
19	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...
20	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...
21	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. ...
22	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.
23	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.
24	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.
25	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.
26	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...
27	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.
28	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.
29	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.
30	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...
31	Digging diversion tunnels at Hoover Dam.	Construction workers digging diversion tunnels using construction equipment.
32	Agitators dumping concrete into buckets	Construction workers are operating machinery (agitators) which dump concrete into buckets. Location is the interior of a diversion tunnel at the Hoover Dam construction site.
33	Blasting at Hoover Dam site	View of construction in Black Canyon at the Hoover Dam site. Construction workers are standing by the railroad tracks looking at a dynamite blast that is taking place in the distance. The Colorado River is visible as...
34	Inside a diversion tunnel -- Hoover Dam construction	Shows a construction worker and power shovel inside a diversion tunnel at the Hoover Dam construction site.
35	Construction of Hoover Dam diversion tunnel	Shows a dump truck and construction workers framed at the mouth of a diversion tunnel during the construction of Hoover Dam.
36	Construction workers inside Hoover Dam diversion tunnel	Shows a power shovel dumping concrete into a dump truck inside a diversion tunnel during the construction of Hoover Dam. Construction workers are visible at work.
37	View showing method of finishing slabs in invert lining.	Construction workers are operating machinery to finish slabs in the invert lining of a diversion tunnel at the Hoover Dam site.
38	Trucks hauling concrete in the diversion tunnel	This photo shows trucks and equipment used for hauling and pouring concrete to form the invert lining in a diversion tunnel at Hoover Dam. Also shows some construction workers.
39	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.
40	Interior of penstock tunnel -- Hoover Dam construction site	Interior view of number 4 raise and plug showing construction. Construction workers can be seen at the far end of the tunnel.
41	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.