The Washington State Department of Transportation (WSDOT) reports that another round of girder setting for a new I-5 overpass in DuPont is scheduled for mid-September. Last April, crews installed girders for a new diverging diamond overpass over I-5. On Monday, September 15 they will return to the area – this time setting girders over the railroad next to the highway. Nighttime travelers who use I-5 through DuPont and Pendleton Avenue on Joint Base Lewis-McChord should plan for delays and detours.
Construction crews working for the WSDOT will place 17 additional girders. The girders measure up to 156 feet long and weigh up to 171,000 pounds. They will connect to the new overpass built in April.
The new diverging diamond overpass will connect to the new roundabout in DuPont.
I-5 Lane and Ramp Closures
Monday, September 15 to Wednesday, September 17:
- A single lane of southbound I-5 will close from 8:00 p.m. to 4:30 a.m. nightly.
- The Center Drive off-ramp (exit 118) to southbound I-5 will be closed from 8:00 p.m. to 4:30 a.m. nightly.
- The Steilacoom-DuPont Road on-ramp (exit 119) to southbound I-5 will be closed from 8:00 p.m. to 4:30 a.m. nightly.
Thursday, September 18:
- The southbound I-5 off-ramp (exit 119) to Steilacoom-DuPont Road will be closed from 8:00 p.m. to 4:30 a.m.
- Southbound I-5 will be reduced to a single lane beginning at 8:00 p.m. All lanes will reopen at 4:30 a.m. the following morning.
Friday, September 19 and Saturday, September 20:
- Southbound I-5 will be reduced to a single lane beginning at 9:30 p.m. All lanes will reopen at 6:00 a.m. each following morning.
- Southbound I-5 off-ramp (exit 119) to Steilacoom-DuPont Road will be closed from 9:00 p.m. to 6:30 a.m.
Traffic Holds in DuPont September 15-17
Between 9:00 p.m. and 5:00 a.m. nightly, crews will intermittently stop traffic for up to 10 minutes at the following DuPont intersections:
- Center Drive and Wilmington Drive.
- The new Steilacoom-DuPont Drive roundabout.
The traffic holds allow crews to safely transport the massive concrete girders.
Southbound I-5 in DuPont will be reduced to a single lane nightly beginning at 8 p.m. All lanes will reopen at 4:30 a.m. daily.
I-5 Project Information
The new overpass will be completed and opened to eastbound traffic in early 2026. It will fully open to traffic in spring 2026 as part of the I-5 Mounts Road to Steilacoom-DuPont Road Corridor Improvements project.
Please help keep road workers safe. When approaching a work zone, please remember to:
- Slow down – drive the posted speeds for worker and traveler safety.
- Be kind –workers are out there helping to keep people safe and improve the roadways.
- Pay attention – both to workers directing travelers and surrounding traffic.
- Stay calm – expect delays, leave early or take alternate routes if possible; no meeting or appointment is worth risking someone’s life.
What’s happening on Interstate 5 RIGHT NOW! I-5 Real-time traffic information for selected cities along I-5. Maps show updates on road construction, traffic accidents, travel delays and the latest traffic speeds. Traffic cameras show congestion at a glance. Visit I-5 Traffic.
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