• Project

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

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 adding HOV lanes to I-5. 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.

Project status
$202 Million

What to expect

The final design visualization is available to view under the maps and drawings tab. The final design incorporates a partial Diverging Diamond Interchange, which reduces vehicle conflict points and improves efficiency with fewer traffic signals.

Construction is expected to begin in late summer 2023. Travelers will see shifted lanes, overnight lane and ramp closures, reduced speed limit in work zones, and potentially short and long-term ramp closures. 

WSDOT is rebuilding the interchange of Steilacoom-DuPont Road (Exit 119) and adding HOV lanes to I-5 to help improve mobility and and improve travel times during peak commute hours. The project will replace the existing at-grade crossing of the railroad with a grade-separated crossing.  The re-configured interchange will tie-in to Steilacoom-DuPont Road just before Pendleton Avenue.