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This is excavation of the block 40 pit as it appeared in December of 1935. After the material was all removed beneath the wooden trusses, the huge block of concrete was poured in the usual manner, and the shelf of dirt, left on this side of it to...
2020-01-26
Here the river has been blocked off by the downstream arm of the crossriver cofferdam, forcing it to flow thru the new channel on the west side of block 40. The upstream arm of the cofferdam is about to be closed, after which the enclosed area...
2020-01-26
After completion of the cross-river cofferdams the enclosed water will be pumped out, and construction of the east end of the dam continued out until it meets block 40 just upstream to the right of the conveyor suspension bridge tower. The...
2020-01-26
Third Volume, Fifteenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Third Volume, Eighteenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Third Volume, Seventeenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Third Volume, Twentieth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Third Volume, Sixteenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Third Volume, Thirteenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Selected material from volume two of: "A History of the Columbia Basin Project: Volume II"

2020-01-26
Selected material from volume three of: "A History of the Columbia Basin Project: Volume III"

2020-01-26
Third Volume, Twenty Seventh issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
Jackhammer crews are here shown working on final bedrock just east of block 40. The buttress wall in the background contains 3,000 cubic yards of concrete, and was rushed to completion as a continuous pour in a week's time. It was placed to...
2020-01-26
Athey 10-yard buggy and Caterpillar bulldozer feeding a tributary conveyor feeder.
1935-03-21
2020-01-26
Excavation activities, including conveyors, in south-east section of area enclosed by the west cofferdam.
1935-03-20
2020-01-26
View of the roof of the Nevada valve house during construction. Note the low strength pedestals and the double layer of railroad iron being placed. The face of the dam can be seen in the background at the right. High scaling equipment is...
1935-08-27
Hoover Dam construction workers observe as Six Companies officials stand in the construction site by a concrete pouring bucket which bears a sign reading: "United States Dept. of Interior, Bureau of Reclamation, Boulder Canyon Project. Pouring 2nd...
1934-06-02
Selected material from volume one of: "A History of the Columbia Basin Project: Volume I"

2020-01-26
Much of the rock excavated from the dam foundation was placed along the downstream river banks as riprap. This item of riprap was bid at a $1.00 per cubic yard by MWAK and at $3.00 by CBI.
2020-01-26
Excavating behind section "C" of west cofferdam for entrance of diverted river through four low blocks in west end of dam. Left foreground shows section of main 60-inch conveyor carrying material to spoil bank in Rattlesnake Canyon. In right...
1936-08-25
2020-01-26
Preparing for block 40 inside west cofferdam.
1935-11-01
2020-01-26
Starting a new steel cell in west cofferdam.
1935-02-02
2020-01-26
Excavation for block 40, cross-river conveyor trestle at right - crossing over cell cluster "D" of west cofferdam.
1935-09-26
2020-01-26
Excavating for block 40 behind section "E" of west cofferdam.
1935-09-26
2020-01-26
Third Volume, Fourteenth issue, of the Mason-Walsh-Atkinson-Kier CO. builders of Coulee Dam Safety Newsletter. Created by the Safety Department and issued to the residents of Mason City and contract workers at Grand Coulee Dam.
2020-01-26
2020-01-26
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