Willamette River Water Treatment Plant

The Willamette River Water Treatment Plant consisted of an overall $43 million project that was constructed by a team that included Montgomery Watson HARZA, the Design Engineer and overall Prime Contractor, with Slayden Construction as the General Contractor for the water treatment plant construction, access roadways, and bridges.

The project was fast-tracked, using an overall 26-month design and construction schedule to deliver a 15 MGD water treatment plant with infrastructure designed for modular expansion to 120 MGD. The project consisted of extensive large diameter (54”, 63”) piping, numerous treatment trains including ballasted coagulation basins, ACTIFLO® pretreatment, ozone generation and contactors, filters, 2.5 MG clearwell, and several pump stations. The project entailed approximately 9,000 CY of concrete, and included 45,000 CY of excavation and 10,000 SF of masonry block buildings. Overall construction duration was 20 months. Most critically, a key substantial completion milestone requiring the plant to provide drinking water to Wilsonville by April 20, 2002, was met successfully, thus ending the city’s building permit moratorium.

Total Project Value: $17.9 million (Slayden’s portion of the project)

Slayden Construction Role: Design-Build Major Subcontractor

Owner: City of Wilsonville

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