Timeline and milestones

  • Voter approval (2016)

  • Milestone Target
    Alternatives development 2018 - 2019
    Board identifies preferred alternative 2019
    Draft Environmental Impact Statement 2019 - 2022
    Board confirms or modifies the Preferred Alternative 2022
    Final Environmental Impact Statement 2023
    Board selects project to be built 2023
    Federal Record of Decision 2023
  • Milestone
    Final route design
    Final station designs
    Procure and commission station and public art
    Obtain land use and construction permits
    Property acquisition/relocation
  • Milestone
    Construction updates and mitigation
    Safety education
    Testing and pre-operations
  • Start of service (2030-2031)

*With greatly depleted revenues from COVID-19, Sound Transit will not be able to deliver many expansion projects on their original timelines. Through a program realignment between now and summer 2021, the Sound Transit Board of Directors is working to determine which plans and timelines for voter-approved projects will need to change due to lower revenue projections, absent receiving alternative revenue. These discussions could affect the scheduled milestone and opening dates for TDLE.