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This project is intended to help relieve chronic traffic congestion and improve mobility along Interstate 5 near Joint Base Lewis-McChord. Crews will rebuild the Steilacoom-DuPont Road (Exit 119) interchange and extend I-5 HOV lanes to Mounts Road.

In July 2015, the Washington State Legislature included $495 million to fund the I-5 Mounts Road to Thorne Lane Interchange - Corridor Improvements project, as part of the Connecting Washington transportation revenue package. The project is funded through a 10 year period, from 2015-2025.

To address congestion at the I-5/SR 528 interchange and on I-5 between Everett and Marysville, WSDOT built a new roundabout at the I-5/SR 529 interchange, added new ramps from I-5 northbound to SR 529 and SR 529 to southbound I-5, extend the I-5 northbound HOV lane from near US 2 to SR 529 and…

We improved mobility on I-5 through Seattle by moving barrier on a 1,500-foot section and creating three through lanes near Seneca Street, adding ramp meters for the Dearborn/I-90 and Cherry Street on-ramps and extending the Active Traffic and Demand Management system north to SR 520.

This project widened northbound I-5 from Portland Avenue to the Port of Tacoma Road to provide room for one HOV lane. As part of this project, WSDOT rebuilt the northbound I-5 Puyallup River bridge and the ramp to northbound SR 167, improved the Portland Avenue interchange, and repaved a portion of…

This project replaced the 1965 southbound I-5 Puyallup River Bridge. The new bridge is built to current seismic standards and is straighter and wider than the previous bridge.

The project also modified the Port of Tacoma Road on-ramp to southbound I-5, demolished the existing old I-5…

Contractor crews working on behalf of WSDOT made improvements to the Slater Road corridor north of Bellingham, between Rural Avenue and Interstate 5. WSDOT contractor crews will removed the existing mini roundabout at the intersection of southbound I-5 and Slater Road, re-orientated the ramps to…

Corrosion from weather can damage bridges. Beginning in summer 2023, contractor crews cleaned and painted the metal surfaces of the I-5 Snohomish River Bridge in Everett to prevent this. This work will prolong the life of the bridge.

To increase safety, improve mobility and reduce congestion, WSDOT rebuilt the entire I-5/SR 16 Nalley Valley interchange.

Reconstruction of the interchange was staged to keep people and goods moving. The first two stages of work rebuilt the westbound and eastbound Nalley Valley…

The Tacoma/Pierce County HOV Program was a series of projects, spanning over 20 years, that build high-occupancy-vehicle (HOV) lanes on I-5, SR 16 and SR 167 in Pierce County.

This project has been suspended. There is no timeline for when it may resume.

The Marine Drive and 88th Street Northeast interchanges near Marysville are frequently congested, with traffic backing up onto I-5. They're also two of only three access points to the Tulalip Tribes reservation. The Tribes are leading this project to improve access and mobility at the…

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…

This is a preservation project that will remove and replace the northbound Interstate 5 East Fork Lewis River Bridge, located just south of Woodland in Clark County. This bridge crosses the East Fork of the Lewis River, Paradise Point State Park and Northwest Toenjes Road, near milepost 18.21.

This project began with a federal Planning and Environmental Linkages (PEL) study focused on Interstate 5 from Marvin Road to Mounts Road. The PEL considered additional technical analyses and input from the community and partners to arrive at a final purpose and need. From there, recommended…

This project repaired the bridge deck, modified expansion joints and installed a polyester concrete overlay on both I-5 northbound and southbound bridges over the North Fork Lewis River. Structural steel repairs were made on the southbound bridge. Travelers enjoy a smoother and safer driving…

In summer 2025, contractor crews repaved an 11-mile stretch of northbound and southbound Interstate 5 between Koontz Road (milepost 69.44) and the SR 507 interchange (milepost 81) in Lewis County.

The project repaired worn pavement by removing old asphalt and replacing it with new…

In spring 2024, contractor crews will begin work to improve the southbound lanes of the I-5 Dike Access Road Bridge that spans over Dike Access Road and the railroad bridge, just north of Woodland, in Cowlitz County, WA.

On Wednesday, June 26, 2024, an oversized load traveling north on I-5 struck and damaged the Koontz Road overpass in Lewis County (mileposts 69.35–69.48).

After the bridge strike, WSDOT bridge crews inspected the bridge and found that one of the main bridge girders, essentially a…

On Sunday, Nov. 14, 2021, an over-height load traveling northbound on I-5 struck and damaged the northbound span of the Koontz Road overpass between mileposts 69.35 and 69.48 in Lewis County.

After the strike, WSDOT bridge crews inspected the damage. They determined that the outer…

Starting in summer 2026, contractor crews will repair and repave two sections of Interstate 5 in Lewis County: between Koontz Road and the State Route 508 interchange and Chamber Way and Salzer Creek.

Over time, weather and heavy traffic have worn down this stretch of I-5, creating…

The driving surface along a 2.2-mile stretch of southbound I-5 from Northeast 179th Street (milepost 9.75) to the I-5/I-205 split (milepost 7.55) is bumpy, uneven and in need of repair.

Contractor crews will begin work in late April 2026 to remove damaged concrete panels and…

To keep travelers and freight moving smoothly across Washington, contractor crews installed ramp meters on six Interstate 5 on-ramps. This system helps reduce traffic, improve safety, and keep trips reliable along the I-5 corridor in Lewis County between Chehalis and Centralia.

This summer, contractor crews will repair pavement, replace guardrails and median barriers, and make repairs to both directions of Interstate 5 between the Lewis-Cowlitz county line (milepost 56.10) and State Route 505 (milepost 64) in Lewis County.

Once complete, this stretch of I-5…

In September 2024, WSDOT replaced worn asphalt on the south side of the 54th Avenue overpass at Interstate 5 in Fife. Preservation paving included the northbound I-5 off- and on-ramps.

We rehabilitated both directions of Interstate 5 between the Duwamish River and Lucile Street in Seattle. Crews replaced hundreds of panels, completed grinding on the highway to eliminate high spots and repaired the expansion joints on the northbound and southbound I-5 overpasses above Military…

This project will resurface the northbound and southbound lanes of State Route 539 from Interstate 5 to Kellogg Road in Bellingham to extend the pavement service life. Crews working for WSDOT will grind and inlay new Hot Mix Asphalt (HMA), perform pavement repair, traffic loop replacement, striping…

In summer 2022 and 2023, WSDOT's contractor, Granite Construction, replaced roughly 100 concrete panels along both directions of I-205 between the Glenn Jackson Bridge near the SR 14 interchange and the I-5/I-205 split and along southbound I-5 between Northeast 179th Street and the I-5/I-205…

WSDOT contractor crews, Northeast Electric Inc., installed new ramp meters at several on-ramps along northbound Interstate 5 and southbound Interstate 205 in Clark County.

Ramp meters, a type of traffic signal, are employed to regulate the rate at which vehicles enter the freeway,…

WSDOT contractor crews, Granite Construction Inc., replaced several of the most damaged concrete panels on southbound Interstate 5 between Ridgefield and the I-5/I-205 split.

This section of I-5 is made up of 8,400 concrete panels. Hundreds of which have cracked, settled and…