The Washington State Department of Transportation (WSDOT) reports that, weather permitting, a portion of the new I-5 interchange in DuPont will open by mid-January. Workers will also fully open the new roundabout in DuPont.
New I-5 Overpass Opens to Southbound Travelers
Once southbound travelers on I-5 begin using the new exit 119 to Steilacoom-DuPont Road, they will notice a few changes. Those going to DuPont will turn right toward the new roundabout, while people heading to Joint Base Lewis-McChord will turn left and take the overpass.
Travelers on northbound I-5 going to DuPont or JBLM will continue to use the existing exit and the 1957 Steilacoom-DuPont overpass.
Temporary Changes Traveling Between DuPont and JBLM
When the new overpass opens, the older will close to southbound traffic. DuPont travelers will use the new Steilacoom-DuPont overpass to reach JBLM or northbound I-5. The old overpass will provide access from JBLM to DuPont or southbound I-5.
Coming in Spring 2026
The rest of the new overpass will open to two-way traffic as a diverging diamond interchange sometime in the spring. The interchange’s design helps traffic move more efficiently. The new overpass will also provide improved access for people to walk, bike or roll between DuPont and JBLM.
Crews will later demolish the 1950’s era overpass, which is classified in poor condition. It does not meet current vertical clearance standards for I-5. Removing the old overpass will require overnight lane closures. WSDOT will announce the dates once they are available
The demolition will allow crews to make final preparations for the opening of the latest I-5 HOV lanes between Mounts Road and Gravelly Lake Drive, which is scheduled for late summer 2026.
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