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The SR 520/I-5 Express Lanes Connection Project will create a dedicated reversible transit and carpool connection between SR 520 and the I-5 Express Lanes, along with a reversible transit/carpool ramp at the I-5/Mercer Street interchange.

This project is complete.

The Montlake Project will improve transportation for both motorized and nonmotorized travel along the corridor with a new SR 520 eastbound bridge over Union Bay. This project also builds a new, three-acre lid covering the highway in Montlake that will…

The SR 520 floating bridge is supported and stabilized by 77 concrete pontoons . The Pontoon Construction Project built a casting basin and 33 of the bridge’s pontoons in Aberdeen, Washington. We built 44 of the bridge’s smaller pontoons in Tacoma, Washington, as part of the Floating Bridge and…

The Portage Bay Bridge and Roanoke Lid Project will replace the aging Portage Bay Bridge with a seismically resilient structure that includes improved bus/carpool travel and an extension of the SR 520 Trail. This project also builds a landscaped lid between Seattle’s Roanoke Park and North Capitol…

The West Approach Bridge North Project extended SR 520’s three westbound lanes, including a transit/HOV lane, from the new floating bridge to Seattle’s Montlake neighborhood. It also expanded the new SR 520 Trail across Lake Washington to Seattle.

Currently, over half the trips from westbound SR 520 are traveling to the Bellevue vicinity. A new project will allow westbound drivers the option to access the downtown Bellevue vicinity by exiting SR 520 onto 124th Avenue Northeast before reaching the heavily congested I-405/SR 520 interchange.…

SR 522 in Snohomish County is an increasingly important east-west route connecting communities between Woodinville and Monroe. One section between Paradise Lake Road in Maltby and the Snohomish River remains one-lane in each direction. We plan to widen the highway to two lanes in each direction,…

This project will remove a fish passage barrier along Cat Whisker Creek at State Route 522, just east of 61st Avenue Northeast in Kenmore. Contractor crews working for WSDOT will remove an existing 6-foot by 3-foot box culvert and replace it with a fish-passable structure. This new structure has…

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.

A culvert below State Route 522…

This project will remove a barrier to fish passage along Martha Creek on State Route 524 near Lynnwood. Contractor crews working for WSDOT will remove the existing culvert and replace it with a fish-passable structure. This new structure has the potential to open more than 1.5 miles of habitat for…

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

A culvert under State Route 524…

This project will replace the State Route 525 bridge overcrossing the BNSF railroad in the city of Mukilteo. The new bridge will include active transportation improvements to improve safety for all travelers and increase connectivity between Old Town Mukilteo and the waterfront, including the new…

In fall 2023, we added 4 feet of width to a sidewalk along northbound State Route 525/Mukilteo Speedway in Mukilteo to make it 7.5 feet wide on a bridge over the BNSF railroad tracks. We also added new ADA-compliant curb ramps and upgraded the railing between Second and First streets.

This project will repave, with Hot Mix Asphalt (HMA), and construct Americans with Disability Act (ADA) upgrades on State Route 525 from the SR 525 Spur, just north of Harbour Place, to 2nd Street. This project is subject to WSDOT’s Complete Streets requirements. Additionally, the paving project…

This project will remove three barriers to fish passage along Box Springs Creek, Maple Creek and Unnamed Tributary to Swamp Creek under State Route 525 near Lynnwood. Contractor crews working for WSDOT will remove existing culverts and replace them with fish-passable structures. These new…

Crews working for WSDOT will pave roughly two miles in both directions of State Route 525 from the Interstate 405 interchange to just south of 148th Street Southwest, as well as, eight ramps. The two bridges over Alderwood Mall Parkway and Maple Road will not be paved. Once contractor crews finish…

Portions of the State Route 526 corridor will be improved with construction of an eastbound lane between Hardeson Road/5th Ave NW and I-5, improved signal operations at the SR 526/527 intersection and new ramp meters from eastbound SR 526 to northbound I-5. Work includes roadway widening in…

As part of WSDOT’s fish passage program, we will build a 26-foot fish-passable structure under SR 527 just south of 164th Street Southeast in Mill Creek. The current 9-foot culvert causes water to flow too fast for fish to continue upstream. The new bridge span will open more than 8 miles of…

As part of the state's fish recovery efforts, WSDOT has made it a priority to reconnect waterways where our roads act as barriers. In western Washington, that means building hundreds of fish passable structures under state highways in the next decade to create habitat gain essential for…

Contractor crews working for WSDOT will repaint the southbound SR 529 Steamboat Slough Bridge between Marysville and Everett, which has deteriorated due to weathering. This project will replace the paint to preserve the existing structural integrity and extend the service life of the bridge.

The Snohomish River and Steamboat Slough bridges had wear and tear from 70 to nearly 100 years of service. Beginning in 2023, crews working for WSDOT rehabilitated a portion of the northbound SR 529 Snohomish River Bridge between Everett and Marysville by repairing or replacing steel truss elements…

This section of SR 531 between 43rd Avenue Northeast and 59th Avenue Northeast in Arlington will be widened to add a second lane in each direction. In addition, roundabouts will be added at the 51st Avenue Northeast and 59th Avenue Northeast intersections to improve safety, travel times and reduce…

This project will pave 2.5 miles of eastbound and westbound State Route 532 from 270th Street SW (milepost 3.4) to just east of 72nd Avenue NW (milepost 6.0). Crews working for WSDOT will rehabilitate the existing roadway surface and update the roadway striping. Additionally, pedestrian curb ramps…

This project will pave 2.6 miles of eastbound and westbound State Route 532 from North Sunrise Blvd. (milepost 0.0) to just east of Smith Road (milepost 2.6). Crews working for WSDOT will rehabilitate the existing roadway surface and update the roadway striping. Additionally, pedestrian curb ramps…

Beginning July 15, contractor crews working for WSDOT will repave a 4.5-mile stretch of State Route 534 in Skagit County. Crews will grind out the existing pavement and lay a fresh layer of asphalt, creating a smoother ride for people who use SR 534 and extending the life of the highway. They’ll…

The State Route 536 Skagit River Bridge received its last coat of paint in 1990. After 36 years, contractor crews will add fresh paint to the bridge to preserve and extend its service life beginning in spring 2026. In addition to painting, this project includes all the preparation work before…

This project will pave two miles of northbound and southbound State Route 539 from SR 546 (milepost 12.55) to Bay Lyn Drive (milepost 10.40). Crews working for WSDOT will rehabilitate the existing roadway surface and update the roadway striping. Additionally, pedestrian curb ramps will be evaluated…

This project will replace the State Route 542 bridge over Glacier Creek in Whatcom County, in the Community of Glacier. The new bridge will connect to the existing Gallop Creek Bridge, and together, these new structures will reduce flood risk, restore salmon habitat, and improve safety for all…

This project will make improvements to the State Route 542 Bagley Creek Bridge (milepost 49) in Whatcom County. Erosion has exposed a footing of the bridge and caused a hole under the footing.

Contractor crews working on behalf of WSDOT will pour additional concrete, move existing…

This project improved the Kamm Ditch fish passage on SR 546/E. Badger Road, east of Northwood Road (milepost 4), in Whatcom County. Construction on this fish passage project began in July 2022.