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Shows a truck and wood forms inside a diversion tunnel during the construction of Hoover Dam.
View of the drilling jumbo working in one of the diversion tunnels during the construction of Hoover Dam.
Shows workers using drills on the floor of Black Canyon at the Hoover Dam construction 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 are various pieces of...

Aerial view of Hoover Dam looking toward the Arizona side. The upstream face of the dam and intake towers are visible. Shows roads and mountains in the surrounding area.

This is a re-touched photo of Hoover Dam and the surrounding area. The Colorado River can be seen below the power houses. The intake towers are visible behind the downstream face. The reservoir (Lake Mead) can be seen forming behind the dam....
View taken from high above, showing the face of the dam, the power houses, some transmission towers, and the intake towers. Lake Mead is nearly filled and there are boats on the water.

View of construction on the Hoover Dam power houses from downstream in Black Canyon. Scaffolding is still present on the lower dam face as it nears completion. The peaks of the Nevada and Arizona intake towers can be seen behind the dam face....

View of the Hoover Dam construction site in Black Canyon from downstream. Framework and concrete pouring forms are visible on the Nevada power house on the left, the Arizona power house on the right and the central portion of the power house at...

Concrete pouring forms being put in place for the construction of the Arizona valve house. A construction worker, a hook hanging from a crane, ropes for high scaling, and a ladder attached to the side of the cliff are visible.
Close-up view of the concrete construction work on the crest of the dam. Partially completed intake tower is visible at upper left. Arizona spillway is also visible.

Aerial view of the Hoover Dam and Lake Mead area with the mountains and Fortification Hill in the background.

View of one of the spillways at Hoover Dam. A man is standing on the bridge which spans the spillway. Transmission towers are visible on the hills above the spillway.

View of the top of the dam from the Arizona side. Intake towers are observed on the Arizona and on the Nevada side. The reservoir (Lake Mead)is more than two-thirds filled with water. Automobiles are seen on the road across the top of the dam.

Close-up view of the machinery which control the outlet works. Two men are pictured at the controls.

Upstream view of Hoover Dam, showing the Arizona outlet works spewing water. The power houses and part of the entrance to one diversion tunnel are visible.

View of a spillway at Hoover Dam with water spilling over. People are standing on the bridge, watching.

View of the Arizona spillway and intake towers on the downstream side of the dam. Cars are visible on the road across the top of the dam and the reservoir (Lake Mead) is beginning to fill.

President Franklin Roosevelt and other dignitaries inspect the dam at the dedication ceremonies.
Upstream side of dam showing intake towers that are almost finished. Reservoir (Lake Mead) has begun to fill, and a man is rowing a boat on the lake. There are derrick cranes visible on both sides of the canyon.

Water pours from the outlet works on the Nevada valve house. Also shows the Nevada valve house, the tops of the power houses on the Nevada and Arizona sides, the Colorado River, and a road by the side of the river.

Color transparency showing the upstream face of Hoover Dam. The dam is illuminated by electric lights making the crest of the dam, the intake towers, and the power house visible.

This color transparency shows the top of the dam, intake towers, a spillway, and the part of the upstream face of the dam. There are cars parked on the road across the top of the dam and the reservoir is almost filled.

Color transparency of the downstream face of the dam, showing the power house. Transmission tower for hyroelectric power and a cableway are visible.

This is a photograph of a blueprint which shows the general layout of Hoover Dam. The photo includes a sectional elevation on center line of the river. Blueprint shows the dam, power plant, upper and lower cofferdam, intake towers, outlet works,...

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