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The City of Portland, Oregon

Portland Water Bureau

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November 2018 Update: Washington Park Reservoir Improvement Project

Construction site with large equipment and wood sheets covering large holes

Large machine drills shafts into ground at construction site

Concrete will be poured for the floor slab, support columns, walls, and roof for the new reservoir. Due to the size and volume of concrete deliveries, they will begin in the early morning, in some cases as early as 2:30 a.m. and will continue through the day with new concrete trucks arriving approximately every 3‐5 minutes. Concrete deliveries should be completed before 6 p.m. but on site work will continue beyond that time to complete the finishing work. The reservoir floor slab will be poured in 12 sections. Each section will be poured in a single day. For the first four slab sections, there will be 30‐40 days between each of the pours. Pour frequency will increase after that as walls, columns, and roof are poured atop completed slab sections. While it is anticipated that there will be several days between pours, there may be limited short term cases where pours will occur daily.

The construction site is slightly constrained with extremely limited space to maneuver once the pouring begins on slab sections. Because of this, it is essential to have multiple routes for delivery of concrete so that truck can access specific locations.

Trucks are allowed to come into the site by the following routes:

  • Off SW Jefferson St. into the jobsite
  • Off W Burnside to SW Tichner to Marconi to Sacajawea to Lewis Clark Way and into the jobsite

A Reliable Future

The Portland Water Bureau is building a new 12.4‐million gallon, seismically reinforced underground reservoir within the footprint of the former Reservoir 3 (upper) with a reflection pool on top, while retaining the historic look and feel of the original. The new reservoir has been engineered to withstand ongoing landside encroachment and potentially catastrophic effects of a major earthquake. The new reservoir will supply water to Portland’s west side and serve 360,000 people, including all downtown businesses and residents, 20 schools, five hospital complexes, and more than 60 parks. This system of water conveyance and storage makes Portland a livable and thriving community, ensuring public health and economic viability.

The first phase of construction focused on reshaping the site. Now in the second phase, the focus will be building the new reservoir structure.

Coming Attractions

Over the next year, you can expect several changes to occur in the activity around the construction site.