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Portland Water Bureau

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1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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April 9, 2015: Geotechnical Testing In Washington Park Scheduled for April

During the week of April 20, the Portland Water Bureau will conduct geotechnical testing in Washington Park.

The testing will involve a crew using equipment to drill geotechnical test anchors along SW Sacajawea Blvd. on the east side of Reservoir 3 and along the promenade on the north side of the reservoir.The testing is scheduled to be completed by mid-May.

This work is supporting the design for the Water Bureau’s proposed Washington Park Reservoir Improvements Project to build a new below-ground reservoir in the same general footprint as the existing upper Reservoir 3, with a reflecting pool on top. The lower Reservoir 4 will be disconnected from the public drinking water system. A lowland habitat area/bioswale and a reflecting pool are also proposed in the Reservoir 4 basin.


Roads around the work site, including SW Sacajawea Blvd., will remain open with intermittent flagging during setup over the drill locations. The sidewalk along SW Sacajawea Blvd. will be closed for public safety.  

TriMet bus stop ID 6177 (SW Sacajawea Blvd. and SW Sherwood Blvd.) on Line 63 will be closed from April 20 to May 4.

Park users, including motorists, bicyclists, and pedestrians, are urged to use alternate routes, remember to drive slowly, and exercise caution when traveling in the construction area.

The geotechnical testing will assist Water Bureau engineers in:

  • Evaluating soil properties and behaviors.
  • Understanding how soils will perform under certain conditions and how it may impact the proposed construction of the new below-ground reservoir.
  • Evaluating, mitigating, and minimizing potential risks associated with issues such as settlement, load-bearing capacity, slope instability, and water infiltration.

For more information about the proposed Washington Park Reservoir Improvements Project, contact Lindsay Wochnick, Water Bureau Senior Community Outreach & Information Representative, at 503-823-3028. Thank you for your patience and cooperation as the Portland Water Bureau works to improve the city’s century-old water system.