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Portland Water Bureau

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Celebrating Steady Progress: Forest Park Low Tank Reservoir & Pump Station

January 2013 aerial photo of worksite
January 2013 aerial photo of worksite 

Just over a year ago in October 2012, contractor Emery & Sons Construction, Inc. began work with oversight from the Portland Water Bureau’s Engineering Services Group to construct a 1.3-million gallon reinforced-concrete underground drinking water reservoir and a 1,408 square-foot pump station on City property off NW Skyline Boulevard, near NW Hawkins Boulevard. 

Identified in the city’s water system as the Forest Park Low Reservoir, the 73-foot diameter reservoir and adjacent pump station are part of an overall plan to better serve the current and future water needs of residents living at higher elevations in the area. It will also help to improve water capacity for emergency fire protection.

November 2013 aerial photo of worksite
November 2013 aerial photo of worksite

In the past 12 months, crews have made significant progress, completing on schedule the following phases of construction:

  • Clearing and grubbing the site
  • Building a maintenance access road
  • Excavating the site for the reservoir and pump station
  • Drilling and grouting 320 soil nails to stabilize the soil slope
  • Installing a detention vault that will assist in managing excess water runoff
  • Pouring the reservoir floor and 50-foot tall walls
  • Pouring the nine interior columns to support the roof
  • Reinforcing the reservoir walls with a tensioned wrap of steel cable
  • Applying shotcrete to the exterior of the reservoir
  • Pouring the reservoir roof
  • Installing an underground vault that houses electrical facilities to power the reservoir
  • Testing reservoir for water tightness

Backfilling around tank

Currently, crews are working to backfill the reservoir which was built 41-feet into the ground. They are also constructing the neighboring 1,408 square foot pump station, already completing the excavation and form placement and working to now complete floor and wall pours for the structure.

The project is on track for full completion in March 2014. For additional information on the project, visit https://www.portlandoregon.gov/water/forestparklowtank.

Lindsay Wochnick
Public Information

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