In just over two years, Portland Water Bureau and Hoffman Construction Company crews have made momentous progress in building the new 25-million-gallon underground reservoir, access roads, overflow basin, and an intricate network of underground piping, multiple vaults, and valve structures at Kelly Butte in southeast Portland.
November 2014 Aerial Photo of Kelly Butte Reservoir worksite
Reservoir: Crews have poured the reservoir’s 394-foot by 296-foot floor, walls, 252 supporting columns, and roof. Functional testing of the new reservoir is in process.
Valve Structures: Crews are installing electrical gear and the HVAC systems in the north and south valve structures. The structures will protect equipment that precisely controls water flow to and from the reservoir.
Pipe Connection: In June 2014, crews completed construction of a 30-foot wide by 60-foot long concrete vault under the westbound lane in the 9700 block of SE Powell Boulevard. By July, SE Powell Boulevard was resurfaced, striped, and paved. The finished vault now houses complex piping that connects the new reservoir to the existing water supply conduit. UPCOMING WORK -- On November 20, crews will install a permanent traffic signal pole at SE 100th Avenue and SE Powell Boulevard. The new pole will replace an existing temporary pole that was relocated to provide crews with room to construct the vault earlier in this year.
Stormwater Pond & Overflow Basin: On Kelly Butte’s hillside, a storm water pond was constructed to contain the runoff from the site. Nestled in the corner of the property an overflow detention basin was built to contain water in the unlikely event the reservoir overflows once placed in service. Over the next few months, crews will install fencing around the stormwater and overflow facilities and place a permeable paver road to support vehicle access.
What’s Next Over the next month and into 2015, crews will:
- Conduct site landscaping and restoration efforts, including mitigation plantings.
- Test the reservoir and valve structures.
- Install permanent gates and fencing around the reservoir.
- Develop roads, providing access to the reservoir and supporting structures.
The entire project is slated for completion in summer 2015.