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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.

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 include regional transit stops and open green…

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.

We are examining solutions to reduce congestion at the I-405/SR 520 interchange. 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…

WSDOT contractor crews will repave sections of SR 522, commonly known as Lake City Way or Northeast Bothell Way, which were last paved in 2002.

SR 522 in Snohomish County is an increasingly important north-south 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 connectivity project will improve the pedestrian access route on State Route 525 in Clinton from the Park & Ride at Deer Lake Road (milepost 8.9) to the Washington State Ferries — Clinton Ferry Terminal (milepost 8.5).

Included in this project are improvements to the…

Through December 2023, our contractor crews will strengthen four bridges along State Route 526 in Everett so they can better withstand a major earthquake. They will wrap steel “jackets” around the columns that support the bridges to hold the concrete together in an earthquake, reducing the chance…

Portions of the State Route 526 corridor will be improved with construction of an eastbound lane between Seaway Boulevard and I-5, improved signal operations at the SR 526/527 intersection and new ramp meters from eastbound SR 526 to northbound I-5.

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…

This project has been delayed until 2025. When it begins, contractor crews working for WSDOT will paint 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…

Corrosion from weather is damaging the Snohomish River Bridge and Steamboat Slough Bridge. Beginning in 2023, crews working for WSDOT will rehabilitate the northbound SR 529 Snohomish River Bridge between Everett and Marysville by repairing or replacing steel truss elements, substructure elements,…

We will build two compact roundabouts on SR 530 at the intersections of 59th Avenue Northeast and 211th Place Northeast, just west of Arlington.

SR 530 is a heavily traveled highway with commuters, large trucks, farm equipment and travelers sharing the highway to reach destination…

This section of SR 531 between 43rd Avenue Northeast and 67th Avenue Northeast in Arlington will be widened to add a second lane in each direction. In addition, roundabouts will be added at three intersections to improve safety, travel times and reduce congestion.

This project provides for the improvement of Logan Creek fish passage along SR 538 in Mount Vernon located in Skagit County by replacing the existing culvert with a new buried fish passage structure.

WSDOT will remove the current fish barrier located on State Route 542/Mt. Baker Highway located between Britton Road and Noon Road in Bellingham and replace it with a single-span bridge for an estimated habitat gain of approximately 3 miles.

This project will remove the existing barrier where an Unnamed Tributary to Fourmile Creek crosses under State Route 544 at milepost 3.51, just west of Noon Road. This location is about two miles west of Everson and 3.5 miles south of Lynden in Whatcom County.

This project will improve the Kamm Ditch fish passage on SR 546 in Whatcom County between milepost 4.13 and milepost 4.27.

This project will replace three fish barriers with fish passable structures. Two of the barriers are located along SR 546 (East Badger Road) on either side of Double Ditch Road and the third barrier is located just west of Double Ditch Road near Lynden. This project is located between milepost .1…

Between summer 2020 through summer 2022, contractor crews working for the Washington State Department of Transportation worked to remove and replace two existing culverts that lead to the Chehalis River located underneath SR 6 near Twin Oaks Road (between mileposts: 46.32 to 46.59) in Lewis County.

This summer, construction crews working for WSDOT repaired and replaced worn sections of asphalt on SR 7. The work zone was broken up into two areas. The first was from the intersection of SR 507 near Joint Base Lewis-McChord, to 169th Street. Crews paved the northbound right lane only. The second…

This project will remove two barriers to fish and repave section of Mountain Highway East (SR 7).

This spring and summer, construction crews working for WSDOT will repair and replace worn sections of asphalt on eastbound State Route 8 and on SR 108. The work on SR 8 will occur between US 12 in Grays Harbor County and US 101 in Thurston County. Crews will also repave a portion of westbound SR 8…

To address increased congestion, WSDOT has widened SR 9 from two lanes to four from its southern starting point to Marsh Road, except for a 3-mile section in the middle—from 176th Street Southeast to SR 96—where there is only one northbound lane and two southbound lanes. This project will add a…

WSDOT will improve the intersection of SR 9 and SR 204 in Lake Stevens by adding four roundabouts and widening SR 9 to two lanes in each direction immediately south of the intersection. These improvements will help manage congestion and improve mobility, provide better access to area businesses,…