A portion of the 110 ft. diameter caisson surrounding pier 2 of the highway bridge. Steel sheet piling forms the outer shell with 36-inch steel I-beams used for waling. Bottom of excavation at elevation 916 and top waling ring at elevation 950.; 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: 4395px × 5686px
Photo credit: © Tango Images / Alamy / Afripics
License: Licensed
Model Released: No

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