Overnight lane and ramp closures on I-5 and SR 516 in the SeaTac, Des Moines and Kent area continue next week, starting Monday, Oct. 14 and continuing through the morning of Friday, Oct. 18, 2024.
The closures will allow contractor crews to set concrete barriers and install guardrails. Crews will also close lanes on local roads in SeaTac, Monday, Oct. 14 through Friday, Oct.18, for road improvements.
This work is part of the SR 509 Completion Project.
I-5 lane closure information
Monday, Oct. 14 through the morning of Friday, Oct. 18
- 8 p.m. to 4:30 a.m. – Up to two lanes of northbound I-5 will close between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
I-5 ramp closure information
Monday, Oct. 14 through the morning of Wednesday, Oct. 16
- 11:59 p.m. to 6:30 a.m. – The eastbound SR 516 ramp to northbound I-5 will close nightly. A signed detour will be in place.
SR 516 lane closure information
Thursday, Oct. 17 through the morning of Friday, Oct. 18
- 8 p.m. to 5 a.m. – One lane in each direction of SR 516 will close nightly between Military Road South and 30th Avenue South.
Local road closure information
Monday, Oct. 14 through Wednesday, Oct. 16
- 7 a.m. to 3 p.m. – One lane of 33rd Avenue in SeaTac will close. Flaggers will alternate traffic.
Monday, Oct. 14 through Friday, Oct. 18
- 7 a.m. to 3 p.m. – One lane of South 208th Street in SeaTac will close. Flaggers will alternate traffic.
An interactive project map that allows people to explore the new SR 509 Expressway, the SR 516 interchange and other elements of the completion project is also available online.
SR 509 Stage 2 online open house
People who live in, work in, or travel through Burien, Des Moines, SeaTac, or Kent can visit the SR 509 Stage 2 online open house to learn more about current and planned construction. The online open house runs through Oct. 25.
SR 509 Completion Project information
The SR 509 Completion Project builds 3 miles of new tolled highway between I-5 and South 188th Street near the south end of Seattle-Tacoma International Airport. The new highway will be completed in stages. The portion currently under construction between I-5 and 24th Avenue is scheduled to open in 2025. The final stage will build the remaining 2 miles of the expressway between 24th Avenue South and South 188th Street. The entire project is planned for completion in 2028.
Puget Sound Gateway Program overview
The SR 509 Completion Project is part of WSDOT’s Puget Sound Gateway Program, which also includes the SR 167 Completion Project in Pierce County. Combined, the two completion projects finish critical missing links in Washington’s highway and freight network.
Know before you go
Before heading out the door, travelers can find the latest information on the WSDOT app, the real-time travel map, or by subscribing to WSDOT’s email and text alerts.
