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Reconnecting waterways where our roads act as barriers is a priority for the state. In western Washington, that means building hundreds of fish passable structures under state highways to create habitat essential for meeting fish recovery goals. Beginning in 2025, WSDOT will build multiple…

Growth in Snoqualmie Valley has made the I-90/SR 18 interchange one of the busiest in the state, causing backups during peak times and busy travel weekends. To improve traffic flow, WSDOT built a diverging diamond interchange and added two lanes on SR 18 between the interchange and Deep Creek.

The project has four locations: Interstate 90 at Issaquah Creek and tributaries, State Route 202 at Little Bear Creek, SR 203 at Thayer Creek, and SR 900 at Green Creek. Each project will enhance fish habitat and allow for fish passage by adding meander bars, modifying stream bed material,…

Crews working for WSDOT will realign the stream and grade the channel for Unnamed Tributary to Lake Creek on Southeast 104th Street just south of the city of Snoqualmie in King County. The stream’s culvert will be removed and replaced with a fish-passable structure. This project is required to…

This work was completed in spring 2023. Contractor crews repaired a steel girder that supports 142nd Place Southeast over Southeast Eastgate Way and I-90. The girder was damaged when it was struck by a truck hauling construction equipment that was too tall.

The Modular Assembly Joints on the I-90 EB East Channel Bridge were deteriorating and reached the end of their service life. Replacing the existing expansion joints preserved the bridge’s structural integrity and extended its service life.

This project will rehabilitate just under one mile of eastbound Interstate 90 Mercer Slough Bridge from Bellevue Way Southeast to I-405. Crews working for WSDOT will install new bearing seats, modify expansion joints and install new expansion seals. This work will preserve the structural integrity…

This project will repave nearly two miles of eastbound Interstate 90 from 118th Avenue Southeast (MP 9.72) to 150th Avenue Southeast (MP 11.55) in Bellevue. Crews working for WSDOT will grind away the existing roadway then apply fresh pavement and lane markings. Crews also will seal transverse…

This project will rehabilitate 4.23 miles of eastbound Interstate 90, from West Lake Sammamish Parkway Southeast (MP 13.77) to East Sunset Way (MP 18.07) in Issaquah. Crews working for WSDOT will remove and replace the existing roadway surfaces. Once contractor crews finish grinding and inlaying…

This project will rehabilitate approximately two and a half miles of the existing pavement on I-90 westbound in order to preserve the roadway surface. Bridges will have HMA (Hot Mix Asphalt) removed, expansion joints replaced, bridge decks repaired, new waterproof membranes installed, and new HMA…

The Interstate Bridge Replacement program is a bi-state effort with the Washington State Department of Transportation and the Oregon Department of Transportation to replace the aging Interstate Bridge along I-5 over the Columbia River between Portland and Vancouver. The program will build a new,…

The Liberty Park Land Bridge - Reconnecting East Central Spokane project is a Washington State Department of Transportation initiative designed to restore non-motorized connections across Interstate 90 that were severed during highway construction in the 1950s. I-90 split the neighborhood,…

The North Spokane Corridor (NSC) is a 10.5-mile multi-modal corridor. When complete, the NSC will be a 60-mile per hour, north/south limited access facility that connects I-90 at the south (just west of the existing Thor/Freya interchange) and connects to US 2 (at Farwell Road) and US 395 (at…

On Thursday, March 19, 2026, debris slides along northbound Interstate 5 near Bellingham brought thousands of cubic yards of boulders, trees and other debris down a slope and across nearby lanes of the freeway. Combined, the slides carved a debris field more than 250 feet wide and 100 feet tall…

We repaired or replaced the concrete on 17 bridges in King, Snohomish, Skagit and Whatcom counties. Before this project, many of these concrete bridge decks had patches covering old potholes and ruts. Contractor crews removed damaged and patched areas and replaced it with new slabs of concrete.…

Crews working for WSDOT will perform crack sealing and asphalt patching on numerous state highways in King, Snohomish, Skagit, Whatcom and Island counties. This preservation work also includes concrete panel replacement on seven miles of Interstate 5 from just north of the Ship Canal Bridge to just…

Crews working for WSDOT will perform crack sealing and asphalt patching on numerous state highways in King and Snohomish counties. The sealing, and patching work will maintain the structural integrity of these sections of roadway for years and improve the driving surface.

This project will resurface the deteriorating chip seal pavement (due to rutting, cracking and normal wear) with a chip seal overlay. This will extend the service life of the existing pavement.
The project will also develop a Complete Streets analysis for design including providing non-…

The Puget Sound Gateway Program combines the SR 509 Completion Project in King County and the SR 167 Completion Project in Pierce County to complete critical missing links in Washington state's highway and freight network. These projects build important new connections to the state's…

WSDOT built Interstate 5, Washington’s main freeway, in the 1960s. The busiest section runs through Seattle with almost 240,000 vehicles traveling across the I-5 Ship Canal Bridge daily. This critical highway now requires major preservation and repairs.

Working with our contractor,…

Dozens of preservation projects are planned to revive Interstate 5 in King and Snohomish counties. Washington’s main freeway was built in the 1960s and needs major preservation and renovation work. Over the coming years, Revive I-5 projects will include pavement repair and full replacement,…

The Seattle multimodal ferry terminal at Colman Dock provides the main cross-sound connection, with auto ferry routes to Bremerton and Bainbridge Island and passenger-only ferry routes to the Kitsap Peninsula, Vashon Island and West Seattle.

Steel pilings that support some areas of…

This project completed final roadway work around the south portal of the SR 99 tunnel and built new pedestrian and bicycle amenities that connect Seattle’s stadiums with the waterfront.

The Southworth Terminal Preservation project will replace the aging terminal to maintain safe and reliable service for those who travel between the Kitsap Peninsula, Vashon Island, West Seattle, and beyond. This terminal is an essential piece of Washington State Ferries’ (WSF) Triangle route and…

Crews will upgrade and replace key elements of the SR 104 Hood Canal Bridge. The construction bolsters systems that guide the bridge together and keep both halves of the bridge connected.

This project removed a fish passage barrier along Lyon Creek where it passed beneath State Route 104 just west of 35th Avenue Northeast in Lake Forest Park. Contractor crews working for WSDOT replaced a 6-by-4-foot box culvert with a 24-foot-wide bridge structure, opening more than 7.5 miles of…

This project improves safety along State Route 104 in Jefferson County at Shine Road/Paradise Bay Road and at State Route 19. At SR 19, a single-lane roundabout has been built. At Shine Road/Paradise Bay Road, a single-lane metered roundabout will be built. The meter will be active only after a…

To improve safety and reduce head-on collisions, crews will construct a single-lane roundabout at State Route 104 and SR 19 (Beaver Valley Road).

Roundabouts are a proven solution to reduce the frequency and severity of collisions while maintaining a consistent flow of traffic.…

This project would relocate travelers heading to and from the Kingston Ferry Terminal to Northeast First Street.

Work to protect Graveyard Spit along State Route 105 is now on a seasonal pause. Construction began in summer 2025 along the shoreline between the Shoalwater Bay Reservation (milepost 19.5) and Panoramic Lane (milepost 20.10) to help protect the road and nearby community from coastal erosion and…