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Crews will build the three remaining miles of SR 510 between Cullens Road and 170th Street Southeast. The roadway will have two lanes. The project will also include a new shared-use path for people who walk, bike or roll.

Crews will build a single-lane roundabout on State Route 510 at the intersection of McAllister Court SE/Rockcress Drive SE in Lacey. The improvement will reduce the potential for collisions.

This project replaced a 2-foot-diameter clay culvert that blocked fish passage with a 20-by-9-foot cement box culvert that allows fish and other wildlife to move freely up and down the creek. The project also placed natural features into the Barnes Creek streambed.

Crews working for WSDOT applied spray sealant to the bridge deck and soffits near expansion joints in both directions of the State Route 520 Evergreen Point floating bridge. The sealant will protect the bridge from corrosion, prolong its service life and help keep the bridge in a state of good…

The SR 520 Bridge Replacement and HOV Program enhances travel safety and mobility with modern, structurally stronger bridges, as well as substantial transit and roadway improvements along this urban corridor. Built in stages, the improvements extend from I-405 in Bellevue to I-5 in Seattle.

This project added bus/carpool lanes in both directions between 108th Avenue Northeast in Bellevue and Lake Washington’s eastern shore. The project also built three landscaped, community-connecting highway lids over the highway, two transit stations in the highway median and the first leg of a…

We replaced the world's longest floating bridge – a four-lane, 1960s-era structure – with a safer, six-lane bridge designed to withstand stronger windstorms and waves. Opened in April 2016, the new bridge also added shoulders for disabled vehicles and a separated, 14-foot-wide path for…

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…

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…