Waluga Reservoir 2

Completed Waluga Reservoir 2 with final landscaping
New entrance to the reservoir site
Inside the new reservoir
Completed Waluga Reservoir 2
Inside the reservoir vault
Tigard and Lake Oswego elected officials at the ribbon-cutting
Completed Waluga Reservoir 2 with final landscaping

Facility Overview

(click image to open PDF, 273 kb)


As part of the system upgrade, increased capacity was required to serve Lake Oswego and Tigard communities. A new 3.5 million gallon (MG) reservoir (Waluga Reservoir 2) was constructed next to an existing reservoir (Waluga Reservoir 1) at the Waluga site on Carman Drive in Lake Oswego.

The new Waluga Reservoir 2 works in tandem with the 4 million gallon Waluga Reservoir 1, to store and provide clean drinking water for both communities. Water stored at the site maintains a reliable water supply for Lake Oswego and the reservoirs enable water supply for Tigard via the Bonita Pump Station. The Waluga Reservoir 2’s capacity and elevation improves water pressure to the nearby service area, which previously experienced substandard pressure during peak demand periods.

Waluga Reservoir 2 was designed and built to the latest structural, building, and seismic codes, and to the highest class of standards (IBC Occupancy Category IV) required for essential public facilities such as hospitals, designated emergency shelters, and structures with critical national defense functions. This improves the water system’s reliability by providing additional storage that can withstand significant seismic events.


Major construction began in spring 2014 and was complete in summer 2015, with final landscaping and site restoration complete in fall 2015. During construction, 10 million pounds of onsite rock was reused as backfill, reducing truck traffic.

A ribbon-cutting and celebration event was held on October 9, 2015 with Partnership and City staff, elected officials, crews and local neighbors.

Planning History

When approached by Partnership representatives about plans to build a new reservoir on City property near the existing Waluga reservoir, many nearby neighbors expressed concern.

Five well-attended meetings were held with neighbors to discuss how to address concerns ranging from safety, to reservoir visibility, to construction impacts. Through these meetings, a Good Neighbor Plan (pdf, 800 KB) was developed. The project team strung balloons to approximate the location of the proposed reservoir to help neighbors visualize the new facility. The plan specified actions and commitments to help ensure the new reservoir and associated pipeline was designed, built, and will be operated in a neighbor-friendly way.

Background Planning Information

More information:

Archive of Construction Updates