Timeline and milestones

  • Voter approval (2016)

  • Milestone Target
    Alternatives development
    Board identifies preferred and other Draft EIS alternatives
    Draft Environmental Impact Statement 2019 - 2021
    Board confirms or modifies the Preferred Alternative 2021
    Final Environmental Impact Statement 2021 - 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
    Groundbreaking
    Construction updates and mitigation
    Safety education
    Testing and pre-operations
  • Start of service (2031/2036)*

*West Seattle: Design is expected to begin in 2023 and be completed in 2026. Construction and testing is expected to begin in 2026 and be completed in 2031. Ballard and downtown Seattle light rail tunnel: Design is expected to begin in 2023 and be completed in 2027. Construction and testing is expected to begin in 2026 and be completed in 2036.

** In recent months, COVID-19 has also impacted Sound Transit’s work with partners to advance WSBLE environmental review work. Until the Board makes realignment decisions in 2021, WSBLE project materials will continue to reflect the original project schedule with the exception of incorporating the recent impacts to the environmental review timeline. These changes include moving the completion dates from 2030 to 2031 for West Seattle and from 2035 to 2036 for Ballard. Schedules are based on limited design and engineering at this phase of project development. Opening dates are subject to further changes under the realignment process.