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Federal Way Extension Light Rail Transit

All dates below are specific to the schedule of the Environmental Review and Permitting processes for this project.

Surface Transportation
DOT Projects
Department of Transportation

The Central Puget Sound Regional Transit Authority (Sound Transit) proposes to extend its light rail system from Angle Lake Station in the city of SeaTac, WA south to the city of Federal Way, WA. Two primary alignments are under consideration. The preferred alignment would generally use the Interstate 5 right of way, and the other would generally use State Route 99 ROW. Each would have at least three stations with additional options possible. Sound Transit is also exploring alternatives that combine the I-5 and SR 99 alignments. Depending on the alternative and the specific location, the alignment could be at-grade, in a trench, or elevated. The project would serve the cities of SeaTac, Kent, Des Moines, and Federal Way in a corridor that struggles with growing but unmet north-south transit demand and the challenge of serving populations that are highly transit-dependent. Anticipated growth will worsen the severe congestion that already hinders mobility and reliability, and limitations imposed by geography and existing infrastructure make high-capacity transit an important investment in this part of the region.


*This project was identified Regionally or Nationally Significant in the original Permitting Dashboard

Permitting Timetable

The permitting timetable below displays data as reported by agencies. Dates for Environmental Review and Permitting processes (Actions) that are in 'Paused' or 'Planned' status are subject to change and are not indicative of a project's final schedule.

  • For information about extensions, select an Action from the timetable below and select 'View Action Details' at the bottom of the page.
Responsible Agency
Actual Completion Date