Civil Engineering

Rivergate Industrial District Habitat

DEA was retained to develop habitat restoration plans for the Port of Portland's Rivergate Industrial District adjacent to the Columbia Slough and Smith and Bybee Lakes Natural Area.

The project is one of the largest restoration efforts undertaken to date in the metropolitan area. It included excavating approximately 600,000 cubic yards of dredge fill, restoring 40 acres of wetland and riparian habitat, creating 4,000 feet of off-channel swales, and constructing an 8,000-foot segment of the 40-Mile Loop Trail.

DEA also implemented a sediment and erosion control plan, created habitat for federally listed fish and turtles inhabiting the area, and provided progressive revegetation and salvaging of more than 900 willow and dogwood rootballs.


“For the past three years, DEA has been our partner in the Rivergate Habitat Restoration project. We've faced many challenges including a demanding scope and schedule, difficult site conditions, and very high expectations from many stakeholders and agencies. As we wrap things up, I wanted to let you know how much the Port appreciates the responsiveness, creativity, and technical excellence DEA has brought to the project. The high quality of your team's input throughout design, permitting, and construction has been invaluable. Thank you for your commitment to helping make our project a success.

—Gerry Meyer, Port of Portland