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Corps Extends Willamette Reservoir Storage Reallocation Study Review Period
Posted on Friday, December 22, 2017 (PST)

The U.S. Army Corps of Engineers is extending the review period for the Willamette Valley reservoir storage reallocation study. The review period now ends December 28, adding six days to the original 45 day review period.


The Corps' system of 13 dams and reservoirs in the Willamette River Basin's primary purpose is flood risk management. However, Oregon residents benefit from reservoir water in a variety of other ways, including hydropower generation and recreation. The Corps is in the process of determining if a reallocation of water storage could grant municipal and industrial water supply, irrigation and fish and wildlife better access to the stored water.


The Corps is studying this issue because demands on the Valley's water supplies have changed due to increasing populations, development, irrigation and the listing of threatened or endangered fish species. Because of this, Portland District and the Oregon Water Resources Department are sponsoring a feasibility study to determine if and how to best reallocate reservoir space during the spring and summer months.


The Corps and the water resources department are seeking comments on a draft integrated feasibility study report/environmental assessment, which includes and a finding of no significant impact for the study. The Corps has prepared these documents for this proposal in accordance with the National Environmental Policy Act. The documents include a brief discussion of the need for the reallocation, as well as environmental considerations resulting from the reallocation. To review the draft assessment, visit


Also see:


--CBB, November 17, 2017, “Corps Seeks Comment On Willamette Valley Reservoir Storage Reallocation Draft Study,”


-- CBB, April 1, 2016, “Corps/Oregon Seek Comment On How Willamette Basin Storage Water Could Be Reallocated In Summer”


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