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No. 1 and no. 2 tunnels View of the mouths of diversion tunnels no. 1 and no. 2. A steel bridge crosses the Colorado River over Black Canyon.
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Construction of diversion tunnels -- Hoover Dam site View of construction taking place at the upper portals of the diversion tunnels for Hoover Dam. Power shovel, buildings, roads, and scaffolding can be seen. Only the exterior portions of the tunnels are visible.
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Partially washed-out truck bridge across from diversion tunnels View from a partially washed-out truck bridge, looking across the flooded Colorado River during construction of Hoover Dam. The mouths of two diversion tunnels are seen in the cliff wall in the background.
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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...
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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.
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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.
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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...
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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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Diversion tunnel at Hoover Dam Looking into the interior of a partially constructed diversion tunnel. There appears to be some sort of scaffolding for construction workers to stand on and the tunnel is illuminated by electric lighting.
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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.
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Looking up Hoover Dam during construction of the diversion tunnels Looking upstream on the Colorado River flowing through Black Canyon at the Hoover Dam construction site. Bridges and catwalks are suspended over the river and the newly-dug mouths of the diversion tunnels are seen on both sides of the canyon....
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Looking up Black Canyon during construction of the diversion tunnels Looking upstream on the Colorado River flowing through Black Canyon at the Hoover Dam construction site. Bridges and catwalks are suspended over the river and the newly-dug mouths of the diversion tunnels are seen on both sides of the...
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Hoover Dam -- diversion tunnels in use Downstream face of Hoover Dam showing water discharge from tunnel outlets. Dam is completed, power houses and part of the Colorado River are visible as well as a cableway above the canyon.
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Hoover Dam -- diversion tunnels in use Downstream face of the completed Hoover Dam with the diversion tunnels in use. The outlet works and power houses are visible. A cableway spans the canyon and some transmission towers are visible high up on the canyon walls....
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Looking up Black Canyon during the construction of the diversion tunnels View of the Colorado River running through Black Canyon at the Hoover Dam construction site. Workers can be seen walking over bridges and catwalks that are suspended over the river, and on dirt roads that run alongside the river. ...
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Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel Interior view of construction on the Nevada side of the no. 2 diversion tunnel. The tunnel walls are illuminated by electric lights. A truck and workers are seen in the middle of the tunnel floor.
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Putting in the ceiling on the Nevada side of the no. 2 diversion tunnel Interior view of construction on the Nevada side of the no. 2 diversion tunnel. Scaffolding rigged with electric lights is standing on the middle of the tunnel floor.
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Sidewall concreting in diversion tunnel no. 4 showing workers Construction inside diversion tunnel no. 4. Steel beams rigged with electric lights frame the tunnel walls and ceiling. A construction truck and workers are seen on the tunnel floor. Two workers are in the foreground.
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Penstock tunnel, Hoover Dam Aerial view of the Hoover Dam construction site on the Colorado River in Black Canyon. Cables are suspended across the canyon and a dirt road runs along the canyon floor. Early construction on a penstock tunnel can be...
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Power house on Nevada side of Hoover Dam View of a power house on the Nevada side taken during the construction of Hoover Dam. Shows power penstock tunnels, scaffolding, construction equipment and trucks.
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Lower portals of Diversion Tunnels No. 3 and No. 4, during the flood. View of the flooded Colorado River in Black Canyon during construction on Hoover Dam. The portals of diversion tunnels nos. 3 and 4 are seen in the canyon wall and bridges and catwalks cross the river. Some buildings...
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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...
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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....
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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.
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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.
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Water flowing into Colorado River, June 16, 1933 The Colorado River flows out of the diversion tunnels in the Hoover Dam construction site in Black Canyon. Bridges are seen crossing the river and the canyon.
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Trash rack at the upper portals of diversion tunnnel no. 2. Center of the photo shows diversion tunnel no. 2 with the curved trashrack barricade being constructed in front. Rebar extends up from the concrete barricades. A train trestle runs across the photo, above the diversion tunnel. Cables can...
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Looking upstream toward the upper plug and raise, in diversion tunnel no. 3. View through diversion tunnel no. 3 showing concrete plug poured to close the tunnel. On the upper left another tunnel angles into the main tunnel. Mud and debris coat the tunnels.
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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...
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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...
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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.
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Aerial view of Hoover Dam Aerial view of Hoover Dam after completion. The diversion tunnels are in use and the downstream face of the dam and the power houses are visible. There are transmission towers on the canyon walls above and one of...
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Aerial view of Hoover Dam Aerial view of Hoover Dam after completion. The reservoir (Lake Mead) is visible behind the dam along with the intake towers. Below the dam, the diversion tunnels are in use and part of the Colorado River is visible....
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Aerial view of Hoover Dam Aerial view of Hoover Dam with the diversion tunnels in use. The power houses are visible as well as the portals to the diversion tunnels. A portion of the Colorado River can be seen.
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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.
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Lewis Construction Company drilling railroad tunnels of U.S. Construction Railroad to Hoover Dam. Construction workers using construction equipment to drill railroad tunnels.
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Aerial view of Hoover Dam and surrounding area Aerial view of Hoover Dam and the surrounding area. Photo is actually a photograph of the area surrounding the dam with an artist's rendering of the dam, reservoir, powerhouses, and mouths of the diversion tunnels superimposed on it. It...
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Aerial view of Hoover Dam Aerial view of Hoover Dam and the surrounding area showing Fortification Hill in the distance. An artist's rendering of the dam, the powerhouses, the mouths of the diversion tunnels, part of the Colorado River, and Lake Mead (the reservoir) have...
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Construction of Hoover Dam Shows construction of Hoover Dam from the upstream side. Buildings and trucks are visible on the cofferdam. One of the portals to the diversion tunnels can be seen at lower left. The intake towers are rising...
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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.
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Construction of Hoover Dam Shows a panoramic view of the Hoover Dam site in Black Canyon. There are trucks and buildings visible on the floor of the canyon. One of the portals to the diversion tunnels is visible. The concrete pouring...
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Construction of Hoover Dam Shows the construction of Hoover Dam from the downstream side. The power houses are nearly completed and one of the portals to the diversion tunnels is visible. There are trucks and buildings on the floor of the canyon....
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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.
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Sidewall concreting inside diversion tunnel no. 4 Construction inside of diversion tunnel no. 4. Steel beams rigged with electric lights frame the walls and ceiling of the tunnel. A construction truck and workers are seen on the tunnel floor. In the distance a gantry...
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Water from the Colorado River Discusses the Boulder Canyon Dam Project (Hoover Dam) and the plan to bring water from the Colorado River to the fifteen cities of the Metropolitan Water District of Southern California by means of the Metropolitan Aqueduct. Includes illustrations and maps.
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Looking across the river at the lower portal of Diversion Tunnel No. 3. View of the flooded Colorado River, facing the unfinished portal of diversion tunnel no. 3 during construction of Hoover Dam. A temporary building is seen on the riverbed in the flood waters.
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Gas-air shovel caught in the flooded Colorado River A stranded gas-air shovel is seen standing in the flooding of the Colorado River riverbed during construction on Hoover Dam. The mouth of one of the diversion tunnels is seen in the canyon wall in the background. Other construction equipment...
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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.
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Looking out of the interior of diversion tunnel no. 2, with gas-air shovel inside the... View out of the upper portal of the unfinished diversion tunnel no. 2. A Bucyrus-Erie 43-B gas-aire shovel is seen near the mouth of the tunnel and reflected in a pool of water inside the tunnel. A man...
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Workers and drilling jumbo inside diversion tunnel no. 4 Construction workers are seen working with a drilling jumbo inside diverson tunnel no. 4.
 

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