I-5 Steilacoom-DuPont Road to Thorne Lane Corridor Improvements
Pierce County, WA
To relieve chronic traffic congestion and improve mobility along I-5 near Joint Base Lewis-McChord, WSDOT is rebuilding interchanges and adding lanes to I-5. Hart Crowser is providing geotechnical recommendations to widen I-5 to accommodate four through-lanes in each direction and construct new northbound I-5 auxiliary lanes. The Berkeley Street and Thorne Lane interchanges are being reconstructed, which includes grade separation over the Sound Transit railroad. Other major work includes utility relocation, earthwork grading, bridge construction and demolition, retaining walls, storm water management facilities, paving, noise walls, and overhead and sign structures.