Interurban Overlay

The City is preparing to begin a roadway rehabilitation project along Interurban Avenue S, an important arterial that varies between two and five lanes and serves both residential neighborhoods and commercial businesses. The project limits extend from approximately 100 feet south of East Marginal Way S to 100 feet north of S 143rd Street, covering about 2.25 miles of roadway. Due to years of heavy vehicle use and high traffic volumes, the asphalt pavement has deteriorated to various degrees and now requires a grind‑and‑overlay treatment to restore a smooth, durable driving surface. The project also includes work at nine signalized and ten unsignalized intersections, as well as numerous driveway approaches throughout the corridor.

In addition to pavement improvements, the project will include upgrades to pedestrian infrastructure and traffic signal systems. Several ADA curb ramps and pedestrian push buttons upgrades. Existing traffic signal loops within the grind‑and‑overlay area will be replaced or converted to video detection to improve long‑term reliability. This federally funded project, supported by a National Highway System (NHS) grant, will enhance safety, accessibility, and overall roadway condition for all users once construction is complete.

• Estimated bid opening: September 2026
• Estimated construction start: October 2026

Duration: Because the bid opening is in September, construction activity this fall/winter will likely be limited to work that is not weather‑dependent, such as curb ramp installation. Once that work is completed, the project may go into winter suspension. The contractor will be expected to return in the spring to complete paving and finish the remaining project elements.

Project Contacts:

City of Tukwila: David Baus, Project Manager – 206-419-1898
Contractor: TBD
Designer: Psomas