Photos | I-5 – Mounts Road to Steilacoom-DuPont Road Corridor Improvements | Engage WSDOT - Online open houses

An aerial photo showing lane shifts on Interstate 5 and the Steilacoom-DuPont Road overpass. Girders will be set over I-5 just north of the existing overpass.

The graphic shows work completed as of February 2025 and where the new bridge girders will be installed during two weekends of night closures in April. The girders for the new overpass will be installed north of the current Steilacoom-DuPont overpass.

Aerial photo of southbound I-5, Mounts Rd. to Steilacoom-DuPont Road

Aerial photo showing lextended HOV lane in both directions of I-5

Bike detour route map

On left, new overpass is part of the I-5 construction at JBLM and DuPont. New ramp includes a chicane to slow travelers down before merging. On right, design visualization showing how the chicane fits into the overall plan.

An aerial photo showing lane shifts on Interstate 5 and the Steilacoom-DuPont Road overpass. Girders will be set over I-5 just north of the existing overpass.

An aerial photo showing lane shifts on Interstate 5 at Pendleton Avenue. Southbound I-5 is shifted to the inside of the road while northbound I-5 is shifted to the outside.

Aerial photo showing locations of new Steilacoom-DuPont Rd overpass and ramps to and from I-5 and new Steilacoom-DuPont Rd roundabout

Aerial photo showing locations of future Steilacoom-Dupont Rd overpass, I-5 ramps and Steilacoom-Dupont Rd roundabout

Photo showing construction of the new wall between the Mounts Road exit and southbound I-5.