Major projects

View current major projects, which are investments we make with local partners to address safety, congestion, mobility for all users and/or fish passage responsibilities.
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Map showing Alaskan Way Viaduct program limits along Seattle waterfront, south end near stadiums and north end near Seattle Center

Alaskan Way Viaduct Replacement Program

The Alaskan Way Viaduct Replacement Program consists of 30 projects led by the Washington State Department of Transportation, King County, the City of Seattle and the Port of Seattle. The Federal Highway Administration is a partner in this effort.
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Tokitae out on the harbor

Ferry system electrification

Washington State Ferries burns more than 18 million gallons of diesel fuel a year, making the system Washington state’s largest consumer. Within the state transportation system, ferries generate the most carbon and other greenhouse gas emissions. We are working on several projects to meet the goals of Executive Order 20-01, which directs WSF to move toward a zero emissions fleet.
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A map showing the  I-405/SR 167 Corridor.

I-405/SR 167 Corridor Program

The I-405/SR 167 Corridor Program stems from the I-405 Master Plan and SR 167 Corridor Plan, foundational documents that guide project development, funding and delivery. The I-405 Master Plan alone includes over 150 projects designed to improve travel between Lynnwood and the Renton/Tukwila area. When combined with SR 167, this north-south corridor forms a 50+-mile transportation system providing travelers with a reliable trip in the express toll lanes, regular lanes and high-capacity transit (bus rapid transit).
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Aerial photo of a congested I-5 through JBLM

I-5 - Mounts Road to Thorne Lane I/C - Corridor Improvements

In July 2015, the Washington State Legislature included $495 million to fund the I-5 Mounts Road to Thorne Lane Interchange - Corridor Improvements project, as part of the Connecting Washington transportation revenue package. The project is funded through a 10 year period, from 2015-2025.
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Images of various construction projects in the I-5 SR 16 Tacoma Pierce County HOV Program

I-5 - SR 16 Tacoma/Pierce County HOV Program

The Tacoma/Pierce County HOV Program is a series of projects, spanning over 20 years, that build high-occupancy-vehicle (HOV) lanes on I-5, SR 16 and SR 167 in Pierce County.
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Map of Snoqualmie Pass East

I-90 - Snoqualmie Pass East Project

The I-90 Snoqualmie Pass East Project improves 15 miles from Hyak to Easton. Phases 1 and 2 from Hyak to the Stampede Pass interchange is complete. Phase 3 begins fall 2021.
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Picture of construction at the Wandermere Bridge in North Spokane.

North Spokane Corridor

The North Spokane Corridor (NSC) is a 10.5-mile multi-modal corridor. When complete, the NSC will be a 60-mile per hour, north/south limited access facility that connects I-90 at the south (just west of the existing Thor/Freya interchange) and connects to US 2 (at Farwell Road) and US 395 (at Wandermere) on the north end. Various stages of construction remain to complete the project.
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This map shows the portions of SR 167 and SR 509 that will be completed under the Puget Sound Gateway Program

Puget Sound Gateway Program

The Puget Sound Gateway Program combines the SR 509 Completion Project in King County and the SR 167 Completion Project in Pierce County to complete critical missing links in Washington state's highway and freight network. These projects build important new connections to the state's ports, will improve the movement of freight and reduce congestion on local roads and highways. Both projects have multimodal benefits and together create 6.5 miles of new bike/pedestrian paths and 3.5 miles of new sidewalks.
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Cars wait for the ferry on the Fauntleroy Ferry Terminal dock

SR 160 - Fauntleroy Terminal - Trestle & Transfer Span Replacement

The SR 160 - Fauntleroy Terminal - Trestle & Transfer Span Replacement project will address the deficiencies of the aging and seismically vulnerable terminal in order to maintain safe and reliable service between West Seattle and destinations on Vashon Island, the Kitsap Peninsula and beyond. The Fauntleroy terminal was built in the 1950s and needs substantial preservation work. This project was identified in the WSF 2040 Long Range Plan given the preservation need and long-established operational constraints and inefficiencies of the terminal.
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An aerial image of a highway bridge with a parallel construction zone where an old bridge is being removed. The highway enters a residential neighborhood to the left.

SR 520 Bridge Replacement and HOV Program

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.

14 fish passage projects were completed in 2020

improving access to 54.2 miles of upstream habitat.

11,959 incidents responded to

by WSDOT’s incident Response teams during second quarter of 2021, 15% more than same quarter in 2020.

41 Pre-existing Funds Projects Advertised

during the eighth quarter of the 2019-2021 biennium.