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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...
2020-10-26
The William L. Finley Papers document the wildlife conservation work of Finley and his wife Irene, and the photography work of Herman T. Bohlman, who worked with Finley in the first decade of the 20th century. Finley was a photographer, filmmaker,...

Here at Grand Coulee Dam, construction methods and mechanisms were extended to new horizons. The conveyor system of handling muck began with the members of the MWAK Co. In 1931-32 the Silas Mason Co. used such a system in construction of the...
2020-10-26
This scene is typical of most of the Grand Coulee Dam Reservoir. Previous to the formation of Lake Mead by Boulder Dam the Gatum Reservoir in Panama was the largest man-made reservoir, having a capacity of 4,413,000 acre feet of storage. Fort...
2020-10-26
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...
2020-10-26
This is the start of the downstream arm of the crossriver cofferdam projecting from the east shore. A power barge is maneuvering two timber cribs into position preparatory to sinking. In the background is the first east side cofferdam,...
2020-10-26
Blocks in dam west of cofferdam; block-outs for penstocks; high and low placing trestles.
1936-12-02
2020-10-26
Upstream face of dam showing low gaps for river diversion. Suspension bridge for aggregate conveyor to Westmix. Mason City across the river.
1936-12-02
2020-10-26
This view taken in the spring of 1935 shows how the early excavation on the east side was conducted with power shovels and trucks; the material being dumped in the forebay area upstream from the dam. Later conveyor systems running to this spoil...
1905-04-18
2020-10-26
This collection includes advertisements, proposals, and specifications of projects conducted within the United States Department of the Interior, U.S. Geological Survey, Reclamation Service. The projects held in this collection were within the...

Reinforcing steel around the 18-ft. diameter penstocks - west power house. High (elev. 1924) trestle at lower left.
1936-11-11
2020-10-26
West end of dam between the two placing trestles ; forms for penstock block-outs in left foreground. Block 40 and west cofferdam in the distance.
1936-06-26
2020-10-26
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.
2020-10-26
2020-10-26
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.
2020-10-26
2020-10-26
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.
2020-10-26
2020-10-26
Grand Coulee Dam from North Cliff, showing water from Columbia River Reservoir passing over the spillway drum gates for the first time I in the construction of the dam. There are eleven drum gates, each 125 feet wide, but only 10 are shown...
1942-06-22
2020-10-26
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.
2020-10-26
2020-10-26
The collection is comprised primarily of an early television series, The Washington State Reporter, which was produced by the National Bank of Commerce and aired on KING-TV (Seattle, Wash.) from November 1951 to circa 1956. The...

The two placing trestles and forms for concrete. Colby and Clyde-Wiley cranes handling the four-yard buckets. Upper right shows aggregate conveyor suspension bridge running to west mixer.
1936-03-24
2020-10-26
Behind section "E" of west cofferdam, showing work on block 40 and wood plug to cells in section "G";
1936-03-03
2020-10-26
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.
2020-10-26
2020-10-26
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.
2020-10-26
2020-10-26
Photographic images and films taken by Paul E. Fields, research fisheries psychologist and avid amateur photographer; Paul E. Fields was a research fisheries psychologist and professor in the Department of Psychology at the University...

Two months later driving of the piling along the west bank of the river for the cofferdam was proceeding rapidly. Note the excavation being done with buggies having a capacity of 30 cubic yards, and drawn buy 75 horsepower tractors, which dump...
2020-10-26
Notice that sections of the cross-river cofferdams are left out to permit the river to flow in its usual channel while the anchor or key cribs are sunk in their proper positions. On Dec. 09, 1936 the last cribs were in position and within 30 hours...
1936-12-09
2020-10-26
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