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Portland Water Bureau

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


1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Washington Park Reservoir Improvement Project

Updated: September 20, 2017

The Portland Water Bureau is rebuilding the Washington Park reservoirs, a project that continues through 2024.  Washington Park reservoirs were built in 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 public health and economic viability.

Project Background

This project is building a new 12.4-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 landside encroachment and potentially catastrophic effects of a major earthquake.
The existing Reservoir 4 (lower) is disconnected from the public drinking water system and is being developed into a lowland wildlife habitat area, bioswale, and reflecting pool.

Developments of Note

During the month of August excavation and reshaping of the east slope behind Pump Station 1 began. Installation of a waterline, storm and sanitary piping behind Pump Station 1 and Dam 3 began. Installation of water line piping along Madison Trail began; this will cause a temporary closure of the trail through the middle of September 2017. To see map of site click HERE.


Rhetta Drennan, a 20-year veteran of community outreach with the City Portland, has joined the Water Bureau. She will be the new lead public information representative for the Washington Park Reservoir Improvement Project. You can reach her at 503-823-8943 or

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Project Overview

Including the project description, map and schedule