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Washington Park Underground Drinking Water Reservoir and Reflecting Pool

Sector: Water Supply and Storage • Location: Portland, Oregon, United States

Source: OregonLive

Project
Completed

The project transformed Washington Park’s two aging open-air drinking water reservoirs into one seismically resilient underground reservoir topped with a cascading reflecting pool and a public promenade. The new reservoir has a capacity of 12.4 million gallons and serves 360,000 people in Southwest Portland. The project addresses EPA regulations banning uncovered reservoirs and is designed to with

Status
Closed
Sector
Water Supply and Storage, Government
Location
Portland, Oregon, United States of America
Updated
22 Jul 2026
Source
OregonLive

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Project Information

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The project “Washington Park Underground Drinking Water Reservoir and Reflecting Pool” is an infrastructure initiative in the Water Supply and Storage sector, located in Portland, Oregon, United States. Taiyo aggregates data on it from OregonLive.

Participants

Sponsoring Agency

Status

Original status

Completed

Taiyo status

Closed

Taiyo last update

2026-07-22

Contact

Not available for this record.

Description

Description

The project transformed Washington Park’s two aging open-air drinking water reservoirs into one seismically resilient underground reservoir topped with a cascading reflecting pool and a public promenade. The new reservoir has a capacity of 12.4 million gallons and serves 360,000 people in Southwest Portland. The project addresses EPA regulations banning uncovered reservoirs and is designed to withstand a Cascadia Subduction Zone earthquake. The promenade around the reflecting pool is set to open to the public on June 14, 2025.

Original sector

Water Supply Infrastructure

Budget

Location

Country

United States of America (USA)

State

Oregon

City

Portland

Source

Source

OregonLive

URL

More Details

Record type

Project

Sector

Water Supply and Storage, Government

Article published date

2025-05-26

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