CIP 4058A – Cooper Mountain Reservoir #2

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Cooper Mountain Reservoir #2

Construction of new Cooper Mountain Reservoir.

Cooper Mountain Reservoir #2 Coming Soon!

The City is currently in the process of constructing a second 5.5-million-gallon water reservoir and associated improvements, on 18250 SW Kemmer Road in Beaverton, to serve existing development on the eastern slope of Cooper Mountain, new development underway in South Cooper Mountain, and future development in the Urban Reserve Area 6B. The reservoir and other associated improvements are designed to provide an aesthetically pleasing site to blend with the neighboring residential community.

Project Benefits

  • Expanded service in South Cooper Mountain and improved service to west Beaverton.
  • Resilient storage and secondary supply built to modern seismic standards.
  • Water storage that is needed during firefighting and on high summer water demand days in Beaverton.

Project Description

Design and construct a second 5.5-million-gallon drinking water storage reservoir and other associated improvements on a 10-acre property in Cooper Mountain. this project also includes design and construction of approximately 1,400 LF of 24-inch diameter drinking water transmission main along SW Kemmer Road; a booster pump station building to serve residents in the City's upper elevations; and a storage building that would house spare equipment and spare parts on site. As a part of this project, two emergency interties with TVWD will serve two different pressure zones. The reservoir and other associated components are designed to provide an aesthetically pleasing site to blend with the neighboring residential community.

Link to Project Drone Videos Coming Soon!

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Project Contact

For general questions and inquiries please contact: Stacy Revay
Phone: 503-713-7809

Project Manager: Priya Dhanapal

Project Justification:

An engineering consultant study in 2013 concluded that growth in water demand in the City’s upper-elevation water service area will exceed the capacity of the existing 5.5-million-gallon reservoir on Cooper Mountain (Cooper Mountain Reservoir No. 1). Approximately 15,000 of the total 70,000 residents served by Beaverton’s water system receive drinking water from the existing upper-elevation water system and storage reservoir, Cooper Mountain Reservoir No. 1. With the annexation of the 544-acre South Cooper Mountain area and growth in other upper-elevation areas of Beaverton, an estimated additional 21,500 people may be added to the City’s upper elevation water service area by 2040. The Upper Zone pump station will be needed to serve higher elevations in the City’s expanded service area (new 860 and 920 zones).

Project Estimated Cost:

The cost of the reservoir and associated improvements is estimated to be $21 Million. The City is funding a large water system construction program to expand Beaverton’s water supply capacity, resilience, and redundancy through the US EPA’s Water Infrastructure Financing Innovation Act (WIFIA). The overall cost of the projects, including the Cooper Mountain Reservoir project and associated improvements, will be completed as a part of the WIFIA Program over a seven-year period (FY 19-20 through FY 26-27). Regarding funding, 49% of the project cost will be funded by the WIFIA loan at an interest rate of 1.85%. Most of the City’s 51% contribution to this project is being assisted by sale of water revenue bonds.

Key Project Milestones

  • Final Design Completed: November 2019
  • Project Bidding and Award: February thru April 2021
  • Anticipated Construction Completion: Fall 2022

Project Area:

Map of project area south of SW Kemmer Rd between 182nd and 175th Avenues.