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Return to Previous PageArrowrock Hydroelectric Project Work Continues

By Staff
Clatskanie Chief

Construction on the 18 megawatt hydroelectric project at the Arrowrock dam on the Boise River in Idaho is progressing as schedule as site work continues, the Clatskanie People’s Utility District (CPUD) announced this week.
June was a busy month as contractors completed the concrete pours for the powerhouse and started to backfill and compact the area around the powerhouse, pictured above is an aerial view. Helicopters were used to transport and set wood power pole structures due to the mountainous terrain near the project. Once all the poles were anchored in place, the transmission wire was ready to be installed (“pulled”). The lower photo is of the staging area for construction crews as they prepare to “pull” wire with the Lucky Peak Reservoir in the back ground.

The first wire pull occurred on July 15, with work expected to continue throughout July one section at a time. It is reported that recent pulls have some of the longest wire spans for the project, spans estimated to be up to 1,028 feet. That is more than three football field lengths between poles, CPUD spokesperson explained.

The transmission line is slated to be energized by the first of August. Interior components of the powerhouse including the turbines, generators and scroll cases, will be delivered in the next couple of months. Due to their large size, the scrollcases will be delivered to the site by a barge. Work around the powerhouse continues and a stair case inside the walls will be completed soon. Testing for the project will occur later this year, with full operation set for early 2010.

“The Arrowrock project is being developed by Clatskanie PUD and five irrigation districts from Idaho and Oregon, including Boise-Kuna, Nampa & Meridian, New York, Wilder and Big Bend, with CPUD purchasing the average 81,000 MWh of electricity expected to be produced annually. That equals approximately seven percent of the district’s power needs and will help satisfy the requirements of the Oregon “renewable portfolio standards” mandate the district faces in the upcoming years.

To view a photo gallery of the construction progress and read about updates on the project, interested persons are encouraged to visit CPUD’s website at Those with questions about this project, may call CPUD 503-728-2163 or email

Clatskanie Chief
Clastskanie, OR
July 23, 2009

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