What to expect from 1-5 construction near JBLM

I-5, Mounts Rd. to Steilacoom-DuPont Rd., corridor improvements

By WSDOT on September 15, 2023

Project overview

To relieve chronic traffic congestion and improve mobility along I-5 in the vicinity of Joint Base Lewis-McChord, WSDOT will rebuild the interchange of Steilacoom-DuPont Road (Exit 119) and extend HOV lanes on I-5 in the DuPont area. This will support congestion relief on I-5 during peak traffic periods while maintaining access to neighboring communities and JBLM. The new interchange includes grade separation of the roadway over the railroad. The final design incorporates a partial Diverging Diamond Interchange, which reduces vehicle conflict points and improves efficiency with fewer traffic signals.

What to expect

Weeknight ramp and lane closures are happing as needed for work at the northbound I-5 ramps to and from Steilacoom-DuPont Road. The contractor has installed barrier along northbound I-5 at this interchange to create a work zone where crews will begin widening efforts. 

Throughout the three-year project, travelers will see shifted lanes, overnight lane and ramp closures, reduced speed limit in work zones, and potentially short and long-term ramp closures. 

Lane closures on northbound I-5 are permitted overnight at the following times:

Lane closures on southbound I-5 are permitted overnight at the following times:

Local road closures

Pendleton Avenue

Steilacoom-DuPont Road

Wilmington Drive and Barksdale Avenue