East Excavation Area

A five-yard shovel and a 13-yard truck on the east side.

1935-05-01
2024-11-25

Excavation and Cofferdam at Columbia River

Excavation and conveyor system behind east cofferdam, cross river conveyor trestle, upstream end of west cofferdam and main line of conveyor to spoil pile in Rattlesnake Canyon. Top of picture shows cement silos.

1935-11-04
2024-11-25

Northeast Corner of Mason City

In the distance is shown dust clouds arising from gravel pit stripping operations. Northeast corner of Mason City is in the foreground.

1935-05-27
2024-11-25

Stripping Brett Gravel Pit

Stripping at Brett gravel pit, using two LeTourneau 6-yard scrapers with a Caterpillar 75.

1935-05-24
2024-11-25

Plan of Gravel Pit and Conveyor System

Section Through Mixer Storage and Gravel Plant

2024-11-25

Stock Pile at Concrete Plant

Raw stock pile at aggregate plant, with trommel screening and gyratory crushing house below.

1935-11-01
2024-11-25

Screening and Washing Plant Below Brett Gravel Pitt.

Aggregate screening and washing plant at foot of Brett gravel pit. Columbia River in distance where is located a 19,500 g.p.m. pumping plant discharging to a 16-inch pipe leading to a 150,000 gallon surge tank seen in lower right hand corner. In...

1935-09-26
2024-11-25

Trommel Scalping Screens

Two Trommel scalping screens, 6 feet by 22 feet, between raw stockpile and balancing pile at Brett gravel pit.

1935-09-01
2024-11-25

Screening and Washing Plant Below Brett Gravel Pitt.

Screens and washing arrangement in aggregate processing plant at Brett gravel pit.

1935-09-01
2024-11-25

Screening and Washing Plant Below Brett Gravel Pitt.

Two Dorr clarifiers, 125-ft diameter and 125-ft. by 250-ft. 3,600,000 gallons at aggregate washing and screening plant, Brett pit.

1935-09-03
2024-11-25

Drainage Tunnels at Brett Gravel Pit

Concrete gate compartments and tunnels under balancing pile, Brett pit.

1935-07-17
2024-11-25

Incoming End of Material Conveyors

Incoming end of one of the raw material 42-inch conveyors on top floor of screening and washing plant at Brett gravel pit.

1935-09-01
2024-11-25

Westmix Concrete Equipment

Sand dewatering rakes at aggregate processing plant, Brett pit.

1935-09-03
2024-11-25

Westmix Concrete Equipment

Three Dorr Bowls in the sand classifier plant.

1935-09-01
2024-11-25

Timber Drainage Tunnel

Laminated timber tunnel under plant stock piles at processing plant, Brett gravel pit.

1935-06-30
2024-11-25

Stock Piles of Gravel

Stock piles of gravel at the aggregate processing plant.

1935-09-15
2024-11-25

Long View of Conveyor Belt

Forty-eight inch conveyor belt transporting finished aggregate from screening and washing plant to mixer stockpiles - capacity 1250 tons per hour.

1935-09-15
2024-11-25

Airplane Tripper

Airplane tripper for unloading finished aggregate at mixing plant stock piles - laminated timber tunnel ready for one set of two parallel piles.

1935-09-03
2024-11-25

Gravel Stockpiles

Storage of aggregate at mixer stock piles - capacity 90,000 tons, or a 3 1/2 day run at maximum concrete output.

1935-04-27
2024-11-25

Suspension Bridge Across Columbia River

Conveyor suspension bridge and west cofferdam. Contractor's machine shop in foreground.

1935-09-26
2024-11-25

Suspension Bridge Across Columbia River

36" belt carrying aggregate to west concrete mixing plant over 3500-foot suspension bridge

1935-11-04
2024-11-25

Concrete Mixing Facilities

Ten 5,000 barrel steel silos of the cement storage and blending plant - air compressor plant at the left.

1935-09-26
2024-11-25

Westmix Concrete Equipment

Two 2,500 c.f.m. air compressors at the cement plant.

1935-10-16
2024-11-25

Gravel Plant Flow Diagram

Cement Storage and Blending Plant

2024-11-25

Pouring Foundation of Grand Coulee Dam

Early forms ready for pouring on bedrock.

1935-12-03
2024-11-25