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Portland Water Bureau

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PROJECT UPDATE: NW Portland Reservoir Project Delayed by Inclement Weather; Slated for Completion in May 2014

Forest Park Low Tank Reservoir Aerial Photo - January 2014

The Portland Water Bureau’s construction project to build a 1.3-million gallon reinforced-concrete underground drinking water reservoir and a 1,408 square-foot pump station in northwest Portland was previously slated for completion in March 2014. 

Due to inclement weather in December 2013 and January 2014, the project was slightly delayed and is now expected to be complete in May 2014, under normal weather conditions.  

In October 2012, contractor Emery & Sons Construction, Inc. began work with oversight from the Water Bureau’s Engineering Services Group to construct the Forest Park Low Tank Reservoir and pump station on City property off NW Skyline Boulevard, near NW Hawkins Boulevard. Crews have made significant progress on the build, completing the following phases of construction: 

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

Currently, crews are working to backfill the reservoir, built 41-feet into the ground, and the adjacent pump station. Soon, the reservoir will be covered and compacted with layers of soil and eventually native grasses.  

For the remainder of the project, the Water Bureau does not anticipate impacts or disruptions to traffic on NW Skyline Boulevard.

The new reservoir and 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.

For additional information regarding the project, visit  

Lindsay Wochnick
Public Information


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