Federal Way Link Extension

In November 2008, voters approved funding for the segment between Sea-Tac Airport and Redondo/Star Lake at South 272nd Street.

On July 23, 2015, the Sound Transit Board selected their preferred alternative for the Federal Way Link Extension, routed along the west side of Interstate 5 with three stations serving Highline College, the Star Lake park and ride and Federal Way Transit Center.

[13][14] A section between Kent/Des Moines and Star Lake stations was redesigned to use a 500-foot (150 m) elevated span due to unstable soils in a wetland along Interstate 5.

[15] The wetlands had been the site of a mudslide that closed a freeway lane in July 2022 and has a high risk of soil liquefaction during seismic events.

[10] The balanced cantilever bridge will be longest span on the Link light rail system and is planned to be buried by soil after it is completed in September 2024.

[19] A site in southern Federal Way occupied by a megachurch was chosen as the preferred alternative in 2021 and confirmed by the Sound Transit board in 2024.