• Project

I-5 - Mounts Rd. to Steilacoom-DuPont Rd. - Corridor Improvements

From 6 a.m. to 3 p.m. each weekday through Saturday, June 15, the right turn lane leaving DuPont Gate will close. One southbound lane on the Steilacoom-DuPont Road overpass will also close.

Access to northbound I-5 will remain open. 

Travelers leaving JBLM via the DuPont Gate are encouraged to use an alternative gate during those times.

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.

Project status
$233.3 Million
Project hotline

What to expect

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.