• Project

I-5 - Steilacoom-DuPont Rd. to Thorne Lane - Corridor Improvements - Complete September 2021

Project overview

To relieve chronic traffic congestion and improve mobility along Interstate 5 in the vicinity of Joint Base Lewis-McChord, WSDOT is rebuilding the interchanges at Thorne Lane and Berkeley Street and adding lanes to I-5. Once construction is finished, the new lane in each direction on I-5 will open as a high occupancy vehicle (HOV) lane.

Fall 2018 - Fall 2021
Project status
$243 Million

What to expect

The project has reached substantial completion. In early 2022, the contractor will finish minor punch list items that require a limited number of overnight ramp closures and shoulder closures. Daytime shoulder closures are allowed on both directions of I-5 from 9 a.m. to 3 p.m. in the project limits. Overnight travelers will see single and double lane closures on northbound and southbound I-5 each week night from 8 p.m. to 5 a.m. each following day. Overnight travelers will also see I-5 ramp closures of 41st Division Drive, Berkeley Street/Jackson Avenue, Thorne Lane/Murray Road and Gravelly Lake Drive. Typically, no two adjacent ramps will be closed overnight simultaneously. Signed detours will be in place.

Project area map of the I-5 Steilacoom-DuPont Road to Thorne Lane Corridor Improvements project.