Lake Oswego - Tigard Water Treatment Plant

West Linn, OR

MWA designed 11 new buildings as part of a large plant expansion project within a suburban neighborhood replacing a 1960’s vintage plant.

The seismically resilient treatment plant expansion triples the plant capacity within a limited footprint using new technologies including high rate clarification, biological filters and new solids facilities. Facing challenges ranging from community opposition to adverse soil conditions, the city relied on MWA to site and design buildings to provide contextual neighborhood interface at plant edges, and consolidate more industrial process facilities to the center of the property. The plan provides amenities that integrate two distinct neighborhoods to the north and south of the plant, these include; public access, walking trails and lush landscaping

The administration, operations, and laboratory building serves as the main plant entrance for visitors and neighborhood interface. The exterior makes use of a natural palette of brick, wood, and Swisspearl accents while providing generous views for staff and plant operators to both the plant and the wooded surroundings. Process facilities like the finished water pump station are designed for both function and for operator comfort and provide ample natural light through use of windows and skylights.

Client: City of Lake Oswego
Cost: under construction
Substantial Completion: 2017

Photos: Thomas Harris