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The City of Portland, Oregon

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

Customer Service: 503-823-7770


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Washington Park Reservoir Improvement Project

  • Project Updates Stay in the know about project progress! Sign up to receive emailed updates.

  • Upper Reservoir - Pump House View The new reservoir is engineered to withstand ongoing landslide encroachment and seismic events.

  • Serving Portland Since 1895 When completed, the new reservoir will provide service for at least another 100 years.

  • Lower Reservoir 4 - Downtown View A lowland wildlife habitat area, bio-swale, and reflecting pool will be constructed.

  • Supplying Water to Portland's West Side Serving more than 360,000 people, 20 schools, three hospital complexes, 60 parks, and major attractions.

  • Upper Reservoir 3 - Grand Staircase View The new reservoir, in the footprint of the historic Reservoir 3 (upper), features a reflecting pool at ground level.

  • Washington Park Reservoir Improvement Project A new 12.4-million gallon, seismically reinforced underground reservoir.

  • Lower Reservoir 4 - Powerhouse View Existing Reservoir 4 (lower) will be disconnected from the public drinking water system.

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Updated: April 18, 2019

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What's Happening Now 

Over the last month the project has reached two milestones: poured the first two foundation slabs and completed the last drilled shaft. We’ve also seen the removal of the two large cranes that have been operating on the bottom of Reservoir 3.

What’s next?

Over the next months crews will continue to form and pour the remaining foundation slabs and install the seismic foam.  Work will also continue on water and sewer pipes between Reservoirs 3 and 4.

At the end of April or beginning of May the third foundation slab will be poured. Also in early May, crews will be pouring the first wall sections. Watch this space for updates on exact day and time.


RESCHEDULED: Early Morning Work – WEDNESDAY, April 3, beginning at 4:30 a.m.

The second pour for the reservoir 3 foundation slab will occur Monday. This pour is weather dependent.

To see time-lapse photos of the pour click HERE.

To see recent photos and learn more about activities over the past month, including photos of the first foundation slab pour, click HERE.

NIGHT WORK, December 2018 - November 2019 (more information HERE)

Due to the size and volume of concrete needed, deliveries will begin in the early morning, in some cases as early as 2:30 am and will continue through the day, with new concrete trucks arriving approximately every 3 - 5 minutes. Concrete deliveries should be completed before 6 pm but on site work will continue beyond that time to complete the finishing work.

Did You Know?

In 1839 the City of Portland Health Laboratory began testing the water supply for bacteria. Today the Water Bureau preforms over 11,000 water quality test a year to ensure the water we deliver to you is safe.

The last rebar cage built for a drilled shaft



The last rebar cage built for the last drilled shaft.

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Project Overview

Including the project description, map and schedule

Traffic Impacts

Beginning April 2, 2018

Community Outreach History

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