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

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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	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...
4	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.
5	First 40 foot slab of concrete poured in lining diversion tunnels	This is a view of the interior of a diversion tunnel when the first 40 foot concrete slab was poured to line the tunnel during construction of Hoover Dam. Lights illuminate the scene and a construction worker can be...
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	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.
10	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.
11	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.
12	Workers and drilling jumbo inside diversion tunnel no. 4	Construction workers are seen working with a drilling jumbo inside diverson tunnel no. 4.
13	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.
14	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.
15	Construction workers using a drilling jumbo inside a diversion tunnel	Construction workers using a drilling jumbo to excavate one of the diversion tunnels.
16	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.
17	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...
18	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...
19	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.
20	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. ...
21	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.
22	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.
23	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.
24	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...
25	Looking upstream at the upper end of no. 1 plug, showing forms for the intake...	Rebar inside a diversion tunnel under construction. A blurry image of two construction workers is at the top of the picture.
26	Looking upstream into no. 1 plug, showing the placing of the high pressure valves and...	Placing of the high pressure valves in one of the diversion tunnels. There are two construction workers in the picture, and the tunnel is illuminated with electric lights.
27	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...
28	Inside a diversion tunnel -- Hoover Dam construction	Shows a construction worker and power shovel inside a diversion tunnel at the Hoover Dam construction site.
29	Construction workers in diversion tunnel, Hoover Dam site	Shows construction workers posing on the drilling jumbo inside a diversion tunnel during the construction of Hoover Dam. Other men are standing on the floor of the tunnel looking up at the jumbo. Electric lights illuminate the tunnel.
30	Construction of Hoover Dam diversion tunnel	View looking upstream through diversion tunnel no. 2 at intersection with inclined tunnel from upstream Nevada intake tower (inscription on back of photo). Shows concrete pouring forms and one construction worker standing looking up the tunnel at bottom...
31	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.
32	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.
33	Portals, Hoover Dam construction	"Shows men placing dynamite to flood entrance blocks away from #3 and #4 Arizona side."(inscription on back of photo) The portals to the diversion tunnels are visible. The Colorado River is shown below the portals and buildings and trucks...
34	Construction of Hoover Dam	"First load of muck used in coffer dam [sic]. Looking at Arizona portals #3 & #4. Water now flowing thru these." (hand-written inscription on back of photo) Shows a dump truck dumping the muck and construction...
35	Diversion tunnel -- Hoover Dam	Shows a man standing inside a diversion tunnel at the Hoover Dam site.
36	Hoover Dam construction	Shows one of the portals to the diversion tunnels. A portion of the Colorado River is visible as well as construction workers and construction buildings.
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	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...