LAKE ROOSEVELT
The Grand Coulee Dam and the Columbia Basin Reclamation Project
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Section I.
THE GRAND COULEE DAM (continued)
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127 miles of heavy steel sheet piling was driven in the west
cofferdam by powerful steam hammers
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Under powerful lights covering an area 3 miles long, work on
the base of the dam went on day and night without interruption
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As firm, clean bedrock was exposed, high steel trestles were built
out from abutments, and from them long-arm cranes placed concrete
in "lifts" 5 feet thick and 50 feet square
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Inside the west cofferdam were built the base of the west power-house
and part of the spillway section of the dam, with low gaps through which
the river was later diverted
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grand_coulee_dam/sec1i.htm
Last Updated: 01-Feb-2008
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