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A regional project that began in March 2024 updated 24 guardrails and attenuators along Interstates 5, 90 and 405, US 2 and State Routes 522 and 527 in King, Snohomish and Whatcom counties. The breakaway cable terminals, or guardrail protective end caps, face oncoming traffic. This project also…

After SR 99 in Seattle was aligned to run through the SR 99 tunnel, the Battery Street Tunnel was decommissioned and filled and the tunnel's northern approach built into a new arterial street (Seventh Avenue North) featuring bus lanes and reconnected intersections.

Washington State Ferries is replacing the aging and seismically vulnerable Colman Dock in Seattle to maintain its critical role as a regional multimodal transportation hub.

Key project elements include: a concrete and steel trestle, main terminal building, entry building (with retail…

In winter 2023, construction began on a project to strengthen multiple highway overpasses along the I-405 corridor to better withstand a major earthquake. Crews placed steel "jackets" around columns at each location, reducing the chance that an overpass could collapse.

The I-405/Brickyard to SR 527 Improvement Project enhances four and a half miles of the corridor, primarily in Bothell, from just south of the State Route 522 interchange and ending at the SR 527 interchange. WSDOT, Sound Transit and design-build contractor Skanska USA Inc., will deliver…

In fall 2023, contractor crews started construction to replace the damaged northern span of the Lind Avenue Southwest bridge over southbound Interstate 405 in Renton. The Lind Avenue overpass is now back open.

WSDOT and design-build contractor Graham Contracting, Ltd. constructed a new on-ramp to northbound I-405 and a new off-ramp from southbound I-405 at Northeast 132nd Street in Kirkland. This type of interchange is known as a half-diamond. Travelers now have the option to access I-405 at Northeast…

WSDOT, Sound Transit, and design-build contractor Graham Contracting, Ltd. are working to reconstruct and improve the I-405/Northeast 85th Street interchange. This project design supports Sound Transit's Stride Bus Rapid Transit (BRT), improves transit connections on Northeast 85th Street, and…

Travelers on Interstate 405 between Renton and Bellevue experience one of the state’s worst commutes. The I-405/Renton to Bellevue Widening and Express Toll Lanes project includes multimodal transportation and safety improvements to offer more reliable travel choices and keep drivers, transit…

The Ripley Lane Stream Connection Project is part of a series of fish barrier removals planned by WSDOT for the I-405/SR 167 corridor. The Ripley Lane Stream Connection Project will construct new stream channels by combining two culverts into one open channel. We determined that the proposed…

Crews working for WSDOT will replace over 100 Portland Cement concrete panels (PCCP) on Interstate 5 in King, Snohomish, Skagit and Whatcom counties and about 40 panels on I-90 in King County. This work will increase the longevity of the roads by strategically replacing failing concrete panels.

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

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…

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.

Two culverts in the interchange…

This project built a noise wall along southbound Interstate 5 from East Edgar Street to Franklin Avenue East. Contractor crews working for WSDOT constructed the new noise wall to abate noise from the I-5 express lanes just south of the Ship Canal Bridge between Lake Union and Portage Bay. The wall…

We installed new overhead ramp meters at the Swift Avenue South, South Michigan Street/South Bailey Street and Northeast 50th Street on-ramps to northbound Interstate 5 in Seattle. The new ramp meters regulate both the general purpose lanes and the HOV lanes. They replaced existing ramp meters that…

This project will build a stormwater treatment facility beneath the north end of the I-5 Ship Canal Bridge. This facility will capture, carry, and clean stormwater runoff from I-5 by removing harmful pollutants before the water flows into the ship canal.

People who use the interchange at I-5 and SR 523 (North 145th Street) in Shoreline need safe and efficient ways to move through this area, using all modes of transportation. This will be increasingly important with the arrival of Sound Transit Link light rail and the new Shoreline South/148th…

This project will remove a fish passage barrier along Thornton Creek under Interstate 5 near State Route 523/NE 145th Avenue in Shoreline. Contractor crews working for WSDOT will replace the two existing 2,000-foot-long, 6-foot culverts with three fish-passable structures. The current culverts are…

This project will remove three barriers to fish passage along two Unnamed Tributaries to Silver Lake and an Unnamed Tributary to Penny Creek under Interstate 5 near 112th Street Southeast in Everett. Contractor crews working for WSDOT will remove existing culverts and replace them with fish-…

WSDOT is building bridges over Sunset Creek in Bellevue along both directions of I-90, Southeast Eastgate Way and Southeast 36th Street in Bellevue. These bridges replace culverts that block fish passage on Sunset Creek, allowing natural stream conditions to return in this section of the waterway…

The Interstate 90 Judkins Park Station – Reconnecting Communities study will identify and recommend changes to the five WSDOT I-90 ramps at Rainier Avenue South to improve safe travel for all modes and increase access to the Judkins Park Link light rail station via transit transfer, walking,…

Several blocked culverts below Interstate 90 and State Route 202 in east King County are a barrier to fish migration and will be replaced with new, larger culverts beginning in 2025. Contractor crews working for WSDOT will replace three culverts under I-90 in Preston and one culvert under SR 202…

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.