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Learn about current transportation network improvement and preservation activities throughout the state.
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341 results
Project
SR 504 South Coldwater Slide – Spirit Lake Outlet Bridge Washout
Timeline: May 2023 - 2026
Shortly after 9 p.m. Sunday, May 14, 2023, more than 300,000 cubic yards of debris from an adjacent hillside fell approximately 2,000 feet above SR 504 and covered the roadway with rock, mud, ice and water, causing catastrophic damage to the 85-foot Spirit Lake Outlet Bridge at milepost 49.
Project
SR 506/1.5 Miles N of Frontage Rd to I-5 – Emergency Bridge Repair
Timeline: Summer 2022 - Mid-to-late 2023
On Tuesday, July 6, 2021, an over height load was traveling southbound on I-5 when it struck and damaged the SR 506/Toledo-Vader Road overpass that spans over the interstate. Following the bridge strike, WSDOT bridge inspectors determined that the damage was extensive and they closed the overpass…
Project
SR 507/N of Connor Rd - Culvert Replacement - Complete Fall 2023
Timeline: Fall 2023
Crews removed and replaced a failing culvert under the highway.
Project
SR 509 Completion Project
Timeline: 2015-2028
The SR 509 Completion Project in King County is part of the Puget Sound Gateway Program, which also includes the SR 167 Completion Project in Pierce County. Together, these projects complete two of the Puget Sound region’s most critical freight corridors and improve access to I-5, the ports of…
Project
SR 509/Miller Creek fish passage
Timeline: 2020 – 2027
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.
A culvert below State Route 509 west…
A culvert below State Route 509 west…
Project
SR 510 - Yelm Loop - New Alignment Phase 2
Timeline: Spring 2025 - Fall 2027
Crews will build the three remaining miles of SR 510 between Cullens Road and 170th Street Southeast in Yelm. The new connection, like the previously built Phase 1, is proposed to be a two-lane highway with bicycle and pedestrian facilities.
Project
SR 513 - Montlake Bridge - Mechanical Rehab, Deck Replacement & Joint Repair - Complete May 2022
Timeline: Summer 2021 - Spring 2022
In 2021, contractor crews working for WSDOT replaced the more than 20-year-old worn grid deck on the Montlake Bridge. They also made expansion joint and mechanical repairs so the movable span can continue to operate reliably and meet the growing multimodal traffic demands of northeast Seattle. In…
Project
SR 516/Barnes Creek fish passage
Timeline: 2021-2024
Prior to construction, which ended in October 2023, a failing clay culvert just 2 feet in diameter carried Barnes Creek under SR 516 near Des Moines. This narrow culvert was a barrier for fish trying to swim upstream. This project replaced that small clay culvert with a new cement box culvert 20…
Project
SR 518/24th Avenue S Bridge - Girder Replacement - Complete November 2023
Timeline: Summer to Fall 2023
During summer 2023, our contractor crews replaced the damaged girder on the 24th Avenue South bridge over SR 518 near the Sea-Tac International Airport. Crews also made bridge drain and drainpipe improvements in the area.
Project
SR 520 - Floating Bridge and Approaches Bridge Decks and Soffit Sealer
Timeline: Summer 2024 - Fall 2024
Crews working for WSDOT will apply 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…
Project
SR 520 148th Ave NE interchange - Overlake Access Ramp - Complete December 2023
Timeline: Summer 2021-Fall 2023
With this Connecting Washington project, we made multiple improvements to the State Route 520/148th Avenue Northeast interchange within the cities of Bellevue and Redmond.
Our contractor, Granite Construction, built a direct-access off-ramp from eastbound SR 520 to the Overlake…
Our contractor, Granite Construction, built a direct-access off-ramp from eastbound SR 520 to the Overlake…
Major Project
SR 520 Bridge Replacement and HOV Program
Timeline: 2011 - 2031
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.
Project
SR 520 Eastside Transit and HOV Project - Complete Summer 2015
Timeline: Construction began 2011; completed in 2015
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…
Project
SR 520 Floating Bridge and Landings Project - Complete Summer 2017
Timeline: Bridge construction began in spring 2012 and was completed in summer 2017.
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…
Project
SR 520 I-5 Express Lanes Connection Project
Timeline: August 2021 - 2024
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.
Project
SR 520 Montlake Project
Timeline: Summer 2019 - 2024
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…
Project
SR 520 Pontoon Construction Project - Complete Spring 2015
Timeline: Construction of the casting basin and pontoons began in Aberdeen in 2011. Pontoon construction ended in spring 2015.
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…
Project
SR 520 Portage Bay and Roanoke Lid Project
Timeline: Estimated 2024-2031
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…
Project
SR 520 West Approach Bridge North Project - Complete December 2017
Timeline: Construction began in September 2014 and finished in December 2017.
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.
Project
SR 520/124th Avenue NE Interchange Improvements Project
Timeline: This project is currently in the preliminary engineering stage.
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.…
Project
SR 522 - I-5 to 61st Ave NE - Paving & ADA Compliance
Timeline: Spring 2020 to Fall 2022
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.
Project
SR 522 - Paradise Lake Rd to Snohomish River Br - Interchange & Widening
Timeline: 2017 - 2027
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,…
Project
SR 522/Thornton Creek Fish Passage
Timeline: 2023-2028
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…
A culvert below State Route 522…
Project
SR 524/Martha Creek to Swamp Creek Fish Passage
Timeline: Fall 2025 - Spring 2028
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…
Project
SR 524/Scriber Creek Fish Passage
Timeline: Spring 2023 - Summer 2028
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…
A culvert under State Route 524…
Project
SR 525 Mukilteo Bridge Over Railroad – Bridge Replacement
Timeline: 2024 - 2028
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…
Project
SR 525 Pedestrian and Traffic Improvements - Complete March 2024
Timeline: October 2023 - March 2024
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.
Project
SR 525 Spur Vic to Mukilteo Ferry Terminal – HMA Paving and ADA Compliance
Timeline: 2024-2026
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 Vic to Mukilteo Ferry Terminal. This project is subject to WSDOT’s Complete Streets requirements. Additionally, the paving project was awarded a $…
Project
SR 525 — Clinton Ferry Terminal Vicinity — Pedestrian Connectivity - Completed June 2023
Timeline: Spring 2023 - Fall 2023
This connectivity project improved 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).
Project improvements included the sidewalk, crosswalks,…
Project improvements included the sidewalk, crosswalks,…
Project
SR 525/Box Springs, Maple Creek and Unnamed Tributary to Swamp Creek Fish Passage
Timeline: Fall 2025 - Spring 2028
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…
166,800 electric vehicle
registrations in Washington in 2023, up from 114,600 in 2022.
87 wetland compensation sites
actively monitored on 918 acres in 2023.
25,000 safe animal crossings
in the Snoqualmie Pass East Project area since 2014.