Concrete bulkhead across the haul ramp in 'block 40' after excavating to elevation 905 (30 feet) and one of the 9-foot trusses added between the main 14-foot trusses for excavation going down another 30 feet to bedrock.; Scope and content: Photograph from Volume Two of a series of photo albums documenting the construction of the Grand Coulee Dam and related work on the Columbia Basin Project.

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Size: 5090px × 3928px
Photo credit: © Alpha Stock / Alamy / Afripics
License: Licensed
Model Released: No

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