• 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 extend HOV lanes on I-5 in the DuPont area. 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. The final design incorporates a Diverging Diamond Interchange, which reduces vehicle conflict points and improves efficiency with fewer traffic signals.

Timeline
2023-2026
Project status
Construction
Funding
$202 Million
Project hotline
253-600-1206

What to expect

Weeknight ramp and lane closures will occur as needed for work at the northbound I-5 ramps to and from Steilacoom-DuPont Road.

Throughout the project, travelers will see shifted lanes, overnight lane and ramp closures, reduced speed limit in work zones, and potential long-term ramp closures. 

Lane closures on northbound I-5 are permitted overnight at the following times:

  • Monday through Thursday from 7:30 p.m. to 4:30 a.m. each following day.
  • Friday from 8 p.m. to 8 a.m. Saturday.
  • Saturday from 8 p.m. to 8:30 a.m. Sunday.
  • Sunday from 9:30 p.m. to 4:30 a.m. Monday.

Lane closures on southbound I-5 are permitted overnight at the following times:

  • Monday through Thursday from 8 p.m. to 4:30 a.m. each following day.
  • Friday from 9:30 p.m. to 8 a.m. Saturday.
  • Saturday from 8 p.m. to 9 a.m. Sunday.
  • Sunday from 7:30 p.m. to 4:30 a.m. Monday

Road lane closures

Pendleton Avenue

  • One lane of Pendleton Avenue between Main Street and West Way is permitted to close daily from 9 a.m. to 2 p.m. and overnight from 7 p.m. to 5 a.m.

Steilacoom-DuPont Road

  • One lane of Steilacoom-DuPont Road between Barksdale Avenue and Pendleton Avenue is permitted to close overnight between 9 p.m. to 5 a.m.

Wilmington Drive and Barksdale Avenue

  • One lane of Wilmington Drive or Barksdale Avenue at the intersection with Steilacoom-DuPont Road  is permitted to close daily between 9 a.m. to 2 p.m. and overnight from 7 p.m. to 5 a.m.

 

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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.

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