About Us

Slayden is a leader in the construction industry, with a primary focus on water and wastewater infrastructure. Slayden is built on strong values, hard work and a commitment to getting the job done right. The success of our company is best expressed through our efforts to provide a safe work place with respected employees and a committed management team. Our approach has provided steady growth in work volume, successful career development for personnel, and an extensive list of satisfied clients for more than 30 years.

Strength through Experience and Knowledge

Through our unwavering dedication to customer service, we have become one of the most respected contractors in the Pacific Northwest and northern California, providing our clients with heavy civil and environmental construction services that include industry-leading preconstruction services and safety practices. Our projects include water and wastewater treatment facilities, dams, fisheries, renewable energy/hydro, river restoration and other heavy civil projects.

Recently with Slayden

Slayden has operated in the Pacific Northwest and northern California for more than 30 years as a leading project delivery contractor. With the ultimate goal of delivering maximum value to our clients and their local communities, we provide single-source, integrated, construction services and the full range of project delivery methods.

Slayden is a US regional division of MWH Constructors, who was recently acquired with funds managed by Oaktree Capital Management in partnership with MWHC’s management.

Same Company – Same People

We are the same company, with more resources, and the same dedicated team committed to providing you the highest level of service.

This is an exciting development for MWH Constructors and our very talented and dedicated employees around the globe,” said Blair Lavoie, Chief Executive Officer and President of MWH. “We have worked hard to grow a world-class portfolio of water and wastewater infrastructure projects, and our partnership with Oaktree will enable us to further improve and expand our services to our customers. With the additional resources of this new partnership, our future is bright.”

Our Services

Preconstruction Services

Planning and Coordination




Value Engineering




Construction Services

Project Controls

Subcontractor Outreach

Commissioning and Startup

Electronic O&M Manuals

Project Closeout

Risk Management

Project Management

Design Management



Alternative Delivery Methods


Construction Manager At Risk (CMAR)



Progressive Design-Build

Flexible Pricing Approaches

Other Services

Community Outreach

Small Business Participation


Core Ideology


To build great people, projects, and relationships.

Core Values

People Matter: We look after people unconditionally with character, honesty, and integrity.

Team Unity: We work as a team to exceed expectations while displaying loyalty and commitment.

Solutions Driven: We adjust positively to challenges encountered.

Future Focused: We make decisions with the long term in mind.

Serious About Safety

For over 30 years, we’ve dedicated ourselves to job site safety, and our track record of success speaks for itself.

Construct Your Future

Slayden is always looking for talented, experienced team players whether it be out on the field or in our corporate office. Start your future with Slayden by applying today!

Select Slayden Projects

Slayden is keeping busy! Check out our projects throughout the last 33 years.