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Signing of the contract between the U.S. government and Six Companies for construction of Hoover... Photo shows one man sitting at a table signing a document while several men standing behind him observe. The men are identified, left to right, as Charles P. "Pop" Squires; P.W. Dent, Assistant Commissioner of Reclamation; Mayor Fred Hesse; unknown;...
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Construction on Hoover Dam Aerial view of Black Canyon, prior to construction of Hoover Dam, showing a row of buildings in the distance.
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Colorado River above Black Canyon before construction of Hoover Dam View of the Colorado River above Black Canyon prior to the construction of Hoover Dam.
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Carl Gray handing Ray Lyman Wilbur the first spike to be driven for the spur... Photo shows, left to right, Governor Balzar of Nevada; Carl Gray, president of the Union Pacific Railroad Co.; Ray Lyman Wilbur, Secretary of the Interior; Governor of Colorado [not named]; in front of crowd outdoors. Gray is handing Lyman the...
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Blasting and construction on Hoover Dam Blasting in Black Canyon for construction. Construction equiqment can be seen along side the Colorado River.
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Frank Crowe and others Frank Crowe, Supt. of Constructon for the Six Companies, standing with five unidentified men at the Hoover Dam construction site.
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Beginning blasting for the Hoover Dam Blasting for the beginning of the Hoover Dam in Black Canyon.
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Workers in transport buses This view shows the swing shift ready to leave from Dormitory No. 2 in Boulder City. Shows the dormitory and transport buses loaded with construction workers.
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Representatives of the Colorado River Commission Representatives of the Colorado River Commission, left to right,unknown, Dr. Roy Martin, Walker Young, Ed Clark, and C.P. "Pop" Squires.
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Visitors at Lookout Point Group of men view the spectacular panorama of the construction site of Hoover Dam from Lookout Point.
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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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Downstream view of Hoover Dam construction site Viewpoint of dam construction from below the lower portals of the diversion tunnels. Muck disposal road shown on both sides of the river. Some trucks are visible in the foreground.
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Interior of low-level concrete mixing plant Interior of the main batching and mixer control station, low-level concrete mixing plant. The operator at this station controls the charging of all aggregates, cement and water into two mixers and also controls discharge of the mixers.
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Sedimentation tank for Six Companies gravel plant. Construction of sedimentation tank in the desert for gravel plant.
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Digging diversion tunnels at Hoover Dam. Construction workers digging diversion tunnels using construction equipment.
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Government and Six Companies officials inspecting the Nevada Spillway Government and Six Companies officials inspecting the Nevada Spillway. Reading from left to right: Norman S. Gallison, H.J. Lawler, Walker R. Young, Charles A. Shea, E.O. Wattis, Dr. Elwood Mead, Frank T. Crowe, R.F. Walter and W.A. Bechtel.
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Sunset on the Colorado River Sunset on the Colorado River looking downstream from the railroad bridge.
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View of mixing plant View of a mixing plant with agitators mounted on White trucks. Looking upstream.
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Machine shop and warehouse group of buildings Shows machine shop and warehouses, surrounded by material storage yards. There is also a train in the picture.
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Interior of Six companies, Inc. machine shop Shows men working on heavy machines in a Six companies, Inc. machine shop.
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Upstream view of Black Canyon during early stage of Hoover Dam construction Aerial view looking upstream of the Colorado River in Black Canyon during the early stages of dam construction. Foot-bridge and truck bridge are visible spanning the Colorado River. Some construction fcilities and equipment are seen on dirt roads on...
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Power shovel and trucks opening up an adit Construction workers are using a power shovel and trucks to open up an adit as part of the construction of Hoover Dam.
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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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Day shift workers boarding transports for the return journey to Boulder City Dam construction workers are boarding transport buses for the return ride to Boulder City.
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Train car dumping gravel into hopper at gravel plant A side-dump car from the gravel pits is dumping gravel into a depressed track hopper at the gravel plant. Train and buildings are visible. An employee is watching the process.
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Close-up of sand classifier in the gravel plant. The photograph is a close-up view of the sand classifier machinery in the gravel plant. Two employees are observing.
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Water clarifier tank at the gravel plant This photo is of a water clarifier tank at the gravel plant It is in the process of de-silting water which was pumped from the Colorado River two miles away.
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Sand classifer in gravel plant producing sand for storage Two workers are monitoring the rake type sand classifier in the gravel plant. This machinery produced finished sand for storage and the stored gravel can be seen in the background.
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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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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.
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Blast scales down the canyon walls for the construction of the intake towers This picture shows blasting in Black Canyon to scale down the canyon walls so that the intake towers can be built for Hoover Dam. Part of the river is visible.
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Nevada Spillway open cut excavation This is an aerial view of Black Canyon which shows the open cut excavation for the spillway on the Nevada side of the canyon.
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Concrete mixing plant in Black Canyon This picture shows a concrete mixing plant on the river bank at the Hoover Dam construction site in Black Canyon. It was taken with a telephoto lens.
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High scaling operations View of Black Canyon with construction equipment on the canyon floor and cables suspended over the canyon. High scalers can be seen on the rock face on the left side of the photo.
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High scaling operations during Hoover Dam construction View of high scaling operations in Black Canyon. Cables are suspended over the canyon.
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Looking up Black Canyon from the dam site Upstream view of Black Canyon and the Colorado River from the Hoover Dam construction site. A temporary dirt road is seen on the left side of the canyon floor, along with some scaffolding. Stray lumber is floating by...
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Looking down Black Canyon on the Colorado River Aerial view of the Colorado River flowing through Black Canyon.
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Aerial view of sundown in Black Canyon at the Hoover Dam construction site View of the Colorado River flowing through Black Canyon at dusk. Bridges and catwalks illuminated by electric lights span the canyon over the river. Other electric illumination is seen throughout the construction site.
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Sundown in Black Canyon at the Hoover Dam construction site Night view of the Colorado River flowing through the Hoover Dam construction site in Black Canyon. Catwalks are seen suspended over the river. The site is illuminated by electric light.
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Hoover Dam site from the Nigger Head, Diversion tunnel construction Aerial view of the Colorado River flowing through Black Canyon during early construction at the Hoover Dam site. A dirt road runs alongside the river and catwalks are suspended over the river.
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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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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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Construction worker operating a tractor during construction of Hoover Dam A construction worker is driving a caterpillar tractor in the rocks.
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Temporary cableway spanning the Colorado River near Lookout Point A temporary cableway filled with construction workers is poised above the Colorado River in Black Canyon near Lookout Point. The Arizona spillway operations are shown in the background.
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Boulder City department store at night Night view of the Boulder City Company Store. Cars are parked alongside the store.
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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.
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Interior of Six Companies, Inc. guest house Shows the interior of a guest house owned by Six Companies, Inc. The table is set for dinner. Also shows other pieces of furniture and room decorations.
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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.
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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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