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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 dedicated transit/carpool lanes and an extension of the SR 520 Trail. This project also builds a landscaped lid between Seattle’s Roanoke Park and North…

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 8.96) to the Washington State Ferries — Clinton Ferry Terminal (milepost 8.51).

Plans call for new sections of sidewalk, crosswalks,…

Portions of the State Route 526 corridor will be improved with construction of an eastbound lane between Seaway Boulevard and I-5, a widened Seaway Boulevard on-ramp to SR 526, 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 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 four 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.

This project will remove the existing barrier where an Unnamed Tributary to Fourmile Creek crosses under State Route 544 at milepost 3.51 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

Beginning in summer 2020 and continuing through fall 2021, contractor crews working for the Washington State Department of Transportation began work to remove and replace two existing culverts leading to the Chehalis River located underneath SR 6 near Twin Oaks Road (between mileposts: 46.32 to 46.…

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…

The intersection of SR 9 and SR 204 in Lake Stevens will be improved 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 and…

This project will improve the passage of migratory fish by replacing the culvert underneath SR 9 at milepost 70.60, where an unnamed tributary runs to Landingstrip Creek in Whatcom County.

A culvert that runs under State Route 9 at milepost 34.7, south of Lake McMurray near the North Centennial Trail Trailhead, was failing and needed to be replaced. The bottom of the culvert had rusted away, which resulted in water washing away the side of the road. This caused a sinkhole on the…

This project will widen State Route 9 between Marsh Road and 2nd Street near the city of Snohomish, build southbound bridges directly to the west of the existing bridges—which will become northbound lanes—over the Snohomish River, and rebuild the on-ramp from 2nd Street to southbound SR 9.

The SR 99 tunnel replaced the Alaskan Way Viaduct along Seattle's central waterfront, carrying State Route 99 beneath downtown Seattle. The 2-mile tunnel opened to drivers in February 2019.

The Washington State Department of Transportation is replacing several luminaires in Island, King, Snohomish, Skagit, Thurston and Whatcom counties with new, energy-efficient light-emitting-diode (LED) luminaires. In addition, some lights will be removed as part of a new, more efficient approach to…

On February 16, 2021, due to heavy seasonal rainstorms and harsh winter weather, the existing culvert drainage system that runs underneath a portion of US 101 at milepost 1.2, just north of the Astoria-Megler Bridge, began to fail causing a portion of the road to give way and sink.

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This project will eliminate multiple barriers for fish under US 101 near Port Angeles and open 41 miles of potential habitat for spawning salmon and resident species. Once complete, the work will simulate what is found in a natural stream bed.

Crews have removed and replaced several…

Crews working for WSDOT built a replicated stream between Coffee Creek and Goldsborough Creek in Shelton. The project also rebuilt both southbound on- and off-ramps at the US 101/West Shelton/Matlock interchange.

WSDOT will replace the US 101 Elwha River Bridge in Port Angeles after serving the community for nearly a century. Replacing the bridge will ensure that the US 101 route continues to be a reliable transportation facility for decades to come.

The new bridge will be 40 feet wide and…

The 465-foot-long, US 101 Hoquiam River Riverside Bridge needed a new protective surface. In summer 2021, contractor crews repainted the bridge's approach spans to preserve the crossing for years to come.

General work activities includes: cleaning, stripping exterior paint and…

This project removes and replaces an outdated culvert under US 101 west of Port Angeles at Indian Creek. To keep traffic moving, crews will construct a temporary bypass near the site to allow for excavation near the stream. Contractor crews will remove the outdated culvert and replace it with a new…

This project addresses multiple barriers to fish that travel under US 101 between Sequim and Discovery Bay in Clallam and Jefferson Counties.

This project removes and replaces several outdated barriers to fish migration under US 101 near Leland Valley Road NE in Jefferson County. The north and south tributaries at mileposts 290.3 and 291.8 will be replaced with larger box culverts, and the site crossing Leland Creek will be replaced with…

This design-bid build fish barrier correction project replaces an outdated culvert along US 101 near Forks at May Creek. The existing metal pipe will be replaced with a 175-foot-long concrete girder bridge for improved fish migration.