TACOMA – All lanes of northbound and one lane of southbound State Route 509 in Tacoma will close the weekend of March 6-9 as crews take another step toward simplifying the Alexander Avenue East intersection.
SEATAC – The first section of a new expressway is about to open in the Puget Sound area, providing travelers with another commuting option in south King County.
At 5:09 a.m. on Saturday, June 28, the Washington State Department of Transportation will open the first mile of the State Route 509 Expressway. The first mile of the SR 509 Completion Project stretches between Interstate 5 and 24th Avenue South in SeaTac.
BURIEN – Construction work is ramping up on the State Route 509 Completion Project in Burien, Des Moines, Kent and SeaTac.
SEATAC – Community, industry and elected leaders joined together in SeaTac on Wednesday, Sept. 25, to celebrate the beginning of construction on the final stage of the State Route 509 Completion Project in south King County.
SEATAC – People interested in learning more about the State Route 509 expressway construction work planned in SeaTac, Burien, Kent and Des Moines can visit an online open house through Friday, Oct. 25.
were recorded on state highways in 2025.
in 2025 due to work zone-related crashes.
in work zones from 2024 to 2025.
