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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Select Slayden Projects

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Management Skills that Help Reduce Costs

"We have been impressed with their management skills, starting with preconstruction where they performed value engineering that reduced costs, lead procurement with detailed bid packages that brought our project qualified subcontractors and manufacturers and produced a schedule that would get our project completed on time. Slayden has continued this into the construction phase by managing the work to stay on schedule."

Randy Rosane, P.E., Project Manager with Water Environmental Services

Positive and Goal-Driven

"Slayden’s positive approach and eagerness to achieve the project goals was a tremendous benefit and a driving force to the project and its success. Slayden achieved all minority, woman, and emerging small business subcontracting goals and also met the 20% Workforce Training and Hiring Program’s apprenticeship requirements. They also held their subcontractors to these same goals and requirements."

Michelle Lostra, P.E., City of Portland, Water Bureau

Strong Communication and Community Outreach

"I feel confident in recommending Slayden for their approach to neighborhood outreach and desire to work with our community outreach and communications team to help keep neighbors informed, resolve issues and mitigate issues."

Katy Fulton, Lake Oswego – Tigard Water Partnership

Efficient and Safe

"I enjoyed their management style, which was efficient while paying attention to cost. This was done without sacrificing safety. I would welcome the chance to work with them in the future."

Daniel G Shepard, Manager, Grants Pass Irrigation District

Positive Relationship Builders

"Slayden has met all conditions of approval and does a great job of keeping the neighborhood informed. Slayden works diligently to accommodate the neighboring citizens. In several cases, Slayden has gone above and beyond the conditions of approval in an effort to solve citizen’s issues. This has led to the development of relationships between the project team and the neighborhood, which have contributed to the project in a positive manner."

Thomas Lebo, Construction Manager, Brown and Caldwell

Respectful, Courteous, and Safe

"Slayden Construction is true to their word, without a doubt I would hire them for future projects. All of the employees that worked at the plant were respectful, courteous, and preformed the duties at hand in a safe manner. I can’t say enough good things about Slayden, as you can see in this evaluation. Surround yourself with good people and it makes you look good. And it doesn’t get any better than Slayden Construction."

William Schmittle, City of Hermiston

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