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The City of Portland, Oregon

Portland Water Bureau

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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: May 2, 2019

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What's Happening Now 

Busy, busy, busy is the best way to describe what is happening on site. Crews have completed the last drilled shaft. The first two sections of the foundation slab have been poured. The two large cranes on the bottom of the reservoir have been removed. The first wall forms are being erected. Spring is in bloom in Washington Park!

To see the April 2019 updates with information and photos of work performed over the past month, click HERE.

What’s next?

May 8: Crews will pour the first reservoir wall sections (weather dependent).

On the week of May 19, the second tower crane will be erected onsite. This will require some temporary traffic revisions. SW Sherwood Blvd. will be closed to all traffic. SW Sacajawea Blvd. will be closed to all traffic below SW Rose Garden Way. Traffic on SW Lewis Clark Way will reverse flow to allow vehicles to exit the park on SW Park Place. Entrance to the park from SW Park Place will be prohibited. See map HERE.

May 31: Crews will pour the forth of eleven slab sections.

See how the elements of the new reservoir fit together within the footprint of the historic reservoir 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?

The last rebar cage built for a drilled shaft

The Water Bureau is a proud supporter of the Oregon Tradeswomen Career Fair, helping young girls and women discover career options in the trades on May 17 and 18. Learn more about the Oregon Tradeswomen Career Fair at



The last rebar cage built for the last drilled shaft.

Project Overview

Including the project description, map and schedule

Traffic Impacts

Beginning April 2, 2018

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