SE 4th Street

City of Sammamish, WA

This project completely reconstructed an existing two-lane rural roadway and created a new three-lane arterial with facilities for vehicles, bikes, and pedestrians to support the City of Sammamish’s new Town Center. Perteet worked with the community and the City Council to develop the solution that was constructed by listening to the diverse opinions presented, developed a unifying set of desired project attributes, and illustrated with the micro-simulation tool VISSIM how different configurations would function.

Perteet provided design and construction management services.


  • Transportation
  • Construction Management


The final solution included modifications at an existing signalized intersection, four new roundabouts, and retention of a stop-controlled intersection. Utility upgrades included undergrounding power and communications, a new sewer main, and upsizing the existing water main to support the future Town Center. Redevelopment of adjoining private properties throughout the corridor is occurring concurrent with the City’s project, and Perteet led the intense coordination so that the public improvements met the needs of the private development.

Construction Management

During the construction phase, the Perteet team of construction management professionals and designers worked with the contractor, City, and third-party utilities to mitigate utility conflicts, modify the design to accommodate the changing landscape along the project, and work through the challenges of major construction in a residential neighborhood. The team CM team was able to deliver this project while working through weather impacts from utility changes, record snowfall, and a labor strike without a significant change from the original final completion date.