With voter approval in 1996, 2008 and 2016, Sound Transit is building the most ambitious transit expansion in the country.
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Auburn Station Parking and Access Improvements
Status: Design phase
Improving station connections and adding parking.
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Boeing Access Road Infill Station
Status: Voter approval phase
Serving Boeing Field & north Tukwila neighborhoods
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Ballard Link Extension
Status: Planning phase
Fast, reliable light rail connections residential and job centers in the Chinatown-International District, downtown, Interbay, and Ballard.
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Bus Base North
Status: Design phase
Adding a new bus maintenance and operations building and a parking structure for buses and other vehicles.
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Downtown Redmond Link Extension
Status: Construction phase
Extending East Link to downtown Redmond.
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DuPont Sounder Extension
Status: Voter approval phase
Adding two stations to the Sounder south line.
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East Link Extension
Status: Construction phase
Connecting the Eastside with reliable light rail.
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Edmonds and Mukilteo Stations Parking and Access Improvements
Status: Planning phase
Improving station connections and adding parking.
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Everett Link Extension
Status: Planning phase
Connecting Snohomish County jobs and housing.
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Federal Way Link Extension
Status: Design and construction phase
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Graham St Infill Station
Status: Voter approval phase
A new station between Columbia City and Othello
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Kent Station Parking and Access Improvements
Status: Planning phase
Improving station connections and adding parking.
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Lakewood Station Access Improvements
Status: Planning phase phase
Improving station connections.
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Lynnwood Link Extension
Status: Construction phase
Connecting Snohomish County with light rail.
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NE 130th St Infill Station
Status: Construction phase
Adding a station to the Lynnwood Link Extension
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North Sammamish Park-and-Ride
Status: Planning phase
Providing transit parking for Sammamish residents.
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Operations and Maintenance Facility East
Status: Open for service phase
Maintaining the growing light rail fleet.
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Operations and Maintenance Facility South
Status: Planning phase
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Puyallup Station Parking and Access Improvements
Status: Open for service phase
Improving station connections and adding parking.
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Sounder Maintenance Base
Status: Planning phase
Efficient maintenance of the growing Sounder fleet
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Sounder South Capacity Expansion
Status: Planning phase
Improving station connections and adding parking.
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South Kirkland-Issaquah Link
Status: Voter approval phase
Connecting Eastside communities with light rail.
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South Tacoma Station Access Improvements
Status: Planning phase
Improving station connections.
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Stride S1 Line
Status: Design phase
Adding new bus rapid transit service along I-405 and SR 518 between Bellevue and Burien.
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Stride S2 Line
Status: Design phase
Adding new bus rapid transit service along I-405 between Lynnwood and Bellevue.
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Stride S3 Line
Status: Design phase
Adding new bus rapid transit service along SR-522 and Northeast 145th Street between Shoreline and Bothell.
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Sumner Station Parking and Access Improvements
Status: Design phase
Improving station connections and adding parking.
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Tacoma Dome Link Extension
Status: Planning phase
Connecting to Pierce County with regional light rail.
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TCC Tacoma Link Extension
Status: Voter approval phase
Extending Tacoma Link from Hilltop area to TCC.
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West Seattle Link Extension
Status: Planning phase
Will provide fast, reliable light rail connections to dense residential and job centers throughout the region.
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Explore projects in our growing system. Drag the map to view more, scroll to zoom and click a project to learn more.
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Project phases: Plans to construction
Explore project phases
Ittakes a lot of work to bring a transitproject into service. Major projects often take years of public involvement, planning, engineering and analysis. Learn about the typical life cycle of a light rail project.
- Explore project phases
Building the system
Learn more about how Sound Transit is building one of the largest transit systems in the country, decided by the voters.
Creating vibrant stations
We're building welcoming stationswith public art, TOD, and sustainable design, so they are more than platforms out of neighborhoods.
Planning future service
Our rapidly growing transit system takes a lot of planning and community involvement to respond correctly to community needs as we grow.
Innovation and technology
Read on for how Sound Transit utilizes research, testing, and implementation of tools and services to keep our system operating for decades to come.
Latest project updates
July 2, 2024
Mountlake Terrace Station
Nightly full closure of 236th St SW
July 2, 2024
Mountlake Terrace Station
Lane closure on 236th St SW
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The Platform
Transit projects are complex, expensive, and necessary in the Puget Sound. With the current size and projected growth of the Puget Sound there is no…
New vibrant, affordable apartments open next to Roosevelt Station
Affordable housing near transit can transform communities and change lives.For Cedar Crossing residents Sofia Guia and Angel Lara, it means…
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Latest project documents
Environmental, Stride S1 Line, Bus Rapid Transit, South King County
Stride S1 Line (I-405 BRT) South Renton Transit Center SEPA Addendum (June 2024)
(PDF Document | 204kB) Updated 06/10/2024
Public outreach, West Seattle Link Extension, Link Light Rail, North King County
West Seattle Link Extension: Q4 2023 External Engagement Report
(PDF Document | 319kB) Updated 06/03/2024
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