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By Dan Bolyard
Them Dam Writers online 

The 31-Mile Grand Coulee tunnel

 

Last updated 2/12/2020 at 10:05am

A proposal to build a 31-mile water tunnel under the Grand Coulee was made by Frank Harris, a civil engineer from Renton. His plan, publicly announced in December 1935, was to expedite the irrigation of approximately 500,000 acres of land in the Columbia Basin by a gravity system, without waiting for Grand Coulee power. He figured that the amount of water required to lift and fill what is now B...



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