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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 will build a new roundabout at the I-5/SR 529 interchange, add new ramps from I-5 northbound to SR 529 and SR 529 to southbound I-5, and extend the I-5 northbound HOV lane from near US 2 to SR 529.

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…

This two-year rehabilitation project replaced 56 expansion joints and repaved 1.25 miles of southbound I-5 between I-90 and Spokane Street. This project is one of dozens that make up Revive I-5, which will rehabilitate the I-5 corridor in the King County area in the next 10 years.

The Stillaguamish River Bridge was in need of new paint to preserve and protect its aging structure. Existing paint on the southbound I-5 bridge was weathered and damaged, allowing corrosion to occur. This bridge preservation project removed old peeling paint, cleaned exposed metal and applied new…

Contractor crews working on behalf of WSDOT will starting work on the Slater Road corridor north of Bellingham, between Rural Avenue and Interstate 5. WSDOT contractor crews will remove the existing mini roundabout at the intersection of southbound I-5 and Slater Road, re-orientating 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 is 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…

WSDOT will construct this project through the design build process, removing two fish barriers, one under SR 11 at 30th Street, the other under Interstate 5, south of the SR11/Old Fairhaven Parkway on- and off-ramps and replacing them with fish passable structures. Additional improvements will be…

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

This project replaced the existing sign bridge on southbound Interstate 5 at Kincaid Street (exit 226) in Mount Vernon that was previously damaged.

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 community and partner input to arrive at a final purpose and need and recommended alternatives to study in…

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…

Along a 12-mile stretch of southbound Interstate 5 in Whatcom and Skagit counties between milepost 243 just north of Nulle Road to milepost 231 near the State Route 11/Chuckanut Drive interchange the pavement was worn, and the pavement was full of cracks, ruts and potholes along the highway. The…

This preservation project will replace the top portion of the deteriorating bridge deck of the Samish River Bridge located on I-5 southbound at milepost 234. Crews will replace the worn surface with a new polyester deck overlay. The paved panel joint seals will also be replaced.

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

Following the bridge strike, WSDOT bridge crews assessed the damage and…

To ensure smooth travel for both commuters and cargo across Washington State, contractor crews will implement an advanced technology system. This system optimizes the existing roadway infrastructure to alleviate congestion, enhance safety, and ensure reliable trips along the I-5 corridor in Lewis…

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…

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., will replace 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…

Reconnecting waterways where roads act as barriers is a priority for the state. In western Washington, this means building hundreds of fish-passable structures under state highways to create habitat that is essential for meeting fish recovery goals.

Three culverts in the…