Looking down onto bedrock from above the lower concrete placing trestle - The Hammerhead or cantilever type crane and a whirley crane on top of trestle. Forms for the base mats in concrete blocks 12G, 14G, and 16G below.; 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: 5088px × 3930px
Photo credit: © Alpha Stock / Alamy / Afripics
License: Licensed
Model Released: No

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