SR-520 Montlake to Lake Washington

SR-520 Montlake to Lake Washington

PBS provided diverse environmental and engineering services for a new overpass, bridge section, and low-impact park space along the longest floating bridge in the world. Services were provided on an ongoing basis by a diverse team of PBS’ engineering, geo-environmental, natural resource, and surveying staff. Design and engineering services were provided during construction for this project for maintenance of traffic, signing and utilities. Ongoing natural resource compliance oversight, UAS progress flights, underground storage tank removal, and ongoing COVID-19 screening were provided for the project team.

Clients: Graham, WSDOT

Location: Seattle, Washington


  • Transportation Engineering
  • Traffic Engineering
  • Civil Engineering
  • Geo-environmental
  • Natural Resources
  • UAS / Surveying
  • COVID-19 Compliance