Raising of Arrowrock Dam No Longer a Consideration, Due to Cost Benefit

BOISE COUNTY – The U.S. Army Corps of Engineers, Walla Walla District, provided a status update for the Boise River Feasibility Study to the Board’s Water Storage Committee members during a special meeting in Boise.
Over the past several years, the Corps, in partnership with the Idaho Water Board worked together on the feasibility study to evaluate an array of alternatives to reduce flood risks and increase the amount of water available for use in the Boise River Basin.
The Boise River Feasibility Study team conducted detailed hydrologic and economic modeling and analysis and prepared cost estimates for the alternatives. Based on preliminary results, the solution for both flood risk and water supply needs appeared to be a raise of Arrowrock Dam. Several potential dam height raises were c...

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