Project overview
This project is intended to help relieve chronic traffic congestion and improve mobility along I-5 near Joint Base Lewis-McChord. Crews will rebuild the Steilacoom-DuPont Road (Exit 119) interchange and extend I-5 HOV lanes to Mounts Road.
What to expect
New Steilacoom DuPont Road ramp to northbound I-5
Travelers likely noticed the new on-ramp has a raised concrete island. It created a curve on the ramp.
The raised island will serve a future purpose. It will help separate traffic coming from JBLM and DuPont when a new bridge across I-5 opens.
The new span will open as a diverging diamond interchange in 2026.
I-5 lane closures
Travelers can expect regular night lane closures on both directions of I-5. The lane closures generally are planned each Monday through Thursday night.
Ramp closures
Ramps will close no earlier than 7 p.m. and will reopen by 4:30 a.m. the next morning. No more than two consecutive ramps will close at a time. A signed detour will direct drivers to the next nearest on- or off-ramp.
The project will add HOV lanes to both directions of I-5.
Crews will rebuild the Steilacoom-DuPont Road interchange.The new interchange will connect to Steilacoom-DuPont Road near Pendleton Avenue. Workers will replace the existing at-grade railroad crossing. Crews will build a new bridge. It will carry travelers over the tracks.
