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...

1932-03-12

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.

1932-03-18

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 seen.

1932-03-18

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.

1932-03-18

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.

1932-03-19

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.

1932-03-19

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.

1932-03-19

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.

1932-03-19

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.

1932-03-23

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.

1932-03-23

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.

1932-03-28

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.

1932-03-28

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.

1932-03-28

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.

High scaling operations during Hoover Dam construction

View of high scaling operations in Black Canyon. Cables are suspended over the canyon.

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 the river's edge.

Looking down Black Canyon on the Colorado River

Aerial view of the Colorado River flowing through Black Canyon.

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.

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.

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.

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....

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 canyon....

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. The newly-dug...

Construction worker operating a tractor during construction of Hoover Dam

A construction worker is driving a caterpillar tractor in the rocks.

1932-03-28

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.

1932-04-01