Seattle, Washington

John Lewis Memorial Bridge

Osborn Consulting developed the stormwater management design for the partially federally funded Northgate Pedestrian Bridge Project, which relied on close coordination with multiple stakeholders. In addition to the complex stakeholder coordination, the site itself is constricted within the right-of-way (ROW), with limited possible options for stormwater management. Our team developed an approach to managing stormwater on-site that worked within the surrounding conditions and provided dispersion where possible, reducing the amount of stormwater runoff and further helping to improve water quality in the basin. We prepared the full PS&E in addition to providing drainage design and a WSDOT Type A hydraulic report for BMPs and conveyance systems within the WSDOT ROW to meet code requirements in the WSDOT Highway Runoff Manual.


Seattle Department of Transportation


Stormwater Drainage

Award Winning

This project was awarded a 2022 AIAWA Civil Design Award and ACEC Best in State Gold Award.

a fitting namesake

Originally called the Northgate Pedestrian Bridge, the now aptly named John Lewis Memorial Bridge honors an African American civil rights leader of the same name who represents unity and societal progression.