Where We Live: Reimagining Washington Park's reservoirs

Where We Live: Reimagining Washington Park's reservoirs

Washington Park Reservoir Improvements, Portland


City of Portland Washington Park Reservoir

The Portland Water Bureau is replacing the Washington Park reservoir, a project that continues through 2024. CMTS is providing Estimating and Quality Assurance contract compliance inspection — specifically Electrical and Mechanical inspection and overall Quality Assurance Management.

Washington Park reservoirs have been in service since 1894. When completed, this project will supply water to Portland’s west side and serve more than 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 the public health and economic viability.

Washington Park Reservoir aerial view with crews working inside the reservoir.

This project is building a new 17.4-million gallon, seismically reinforced below-ground reservoir, within the footprint of the existing Reservoir 3 (upper) with a reflection pool/water feature on top. While retaining the historic look and feel of the original reservoir, it has been engineered to withstand ongoing landslide encroachment and potentially catastrophic effects of a major earthquake.

Curved edge rebar work on Washington Park Reservoir, Photo courtesy of portlandandoregon.gov

The existing Reservoir 4 (lower) has been disconnected from the public drinking water system and is being developed into a lowland wildlife habitat area, bioswale, and reflecting pool. 

Washington Park Reservoir improvements