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April 5 2026 Vol. X • No. 7
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Last Part of I-5 Improvement Project Aims for Fall Finish By Lori Tobias CEG CORRESPONDENT
The final portion of a multiphase effort to combat congestion on a busy stretch of Washington’s Interstate 5 is under way and on target for completion in late fall 2026. The $240 million I-5 Mounts Road to Steilacoom-Dupont Road Corridor Improvements project is next to Joint Base Lewis-McChord, one of the largest military installations on the West Coast. “We are diligent in working with Joint Base Lewis-McChord to make sure they understand what’s happening and what their needs are, so we can take care of the take care of the people who are taking care of our country,” Doug Adamson, a spokesperson for the Washington State Department of Transportation (WSDOT) told Construction Equipment Guide. “A lot of this work has involved parts of the Interstate 5 access going onto Joint Base Lewis-McChord itself. In months, we’re going to The new bridge is being built be rebuilding the gate, which in sections on I-5 to provide serves so many soldiers, miliadditional clearance for tary contractors and other peovehicles traveling on ple who are going on to the Pendleton Avenue. base at that time. So, it’s an awful lot of work.” The project — the third in a series of projects to widen I-5 — includes the construction of a new overpass at exit 119, which will be the third diverging diamond overpass in the state. see INTERSTATE page 8
During November 2025, construction crews finished pouring the concrete driving surface of the new I-5 Steilacoom-DuPont bridge over the railroad tracks.