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Kelly Butte Reservoir: Building for Today, Planning for Tomorrow

July 2014 aerial photo of worksite
July 2014 aerial photo of worksite 

In just under two years, Portland Water Bureau and Hoffman Construction Company crews have made momentous progress in building the new 25-million-gallon underground reservoir.  As part of the project, a new access road, an overflow basin, multiple vaults and valve structures, and an intricate network of underground piping were constructed atop Kelly Butte in southeast Portland. 

  • Reservoir: Crews have completed pouring the reservoir’s 400-foot by 300-foot floor and roof, as well as 252 supporting columns, and its five walls (four sides, one divider wall). Work to install appurtenances inside the reservoir (washdown piping, stairs, railings) are underway. Electrical and instrumentation systems will be installed and operating to create a functioning facility. Testing of the new reservoir is scheduled to begin later this summer.
  • Valve Structures: During July, crews will install electrical systems and conduits, as well as the HVAC systems in the north and south valve structures. The structures are designed to protect equipment that precisely control water flow to and from the reservoir.
  • Pipe Connection: In February, crews began construction of a large concrete vault under the westbound lane in the 9700 block of SE Powell Boulevard. By late June, the vault was constructed, waterproofed, and backfilled. In early July, SE Powell Boulevard was resurfaced, striped, and paved.
  • Overflow Detention Basin & Stormwater Overflow Pond: Currently under construction is a new detention overflow basin and storm water pond. 

Upon completion in summer 2015, the Kelly Butte Reservoir will serve Portland's east‐side water customers, and be a stopover to supply water to the Washington Park reservoir and southwest Portland area water storage tanks.

For additional information on the Kelly Butte Reservoir project, visit http://www.portlandoregon.gov/water/kellybutte.

Lindsay Wochnick
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