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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 approximately 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.
After several postponements due to weather, the first of 11 foundation slab sections was poured Monday, March 4. Using two pumper trucks stationed on the north and south sides of the Reservoir 3 site, concrete trucks arrived approximately every five minutes and kept the pumpers and crew busy all day and into the night. You can see a time lapse video of the process on the webpage at www.portlandoregon.gov/water/wpreservoirs.
Over the next year, you can expect several changes to occur in the activity around the construction site.
Learn more about the Washington Park Reservoir Improvement project and how the Water Bureau is investing in Portland's future.