Lane and ramp closures on I-5, SR 516 and SR 509 in Burien, Des Moines, SeaTac and Kent continue this week through the morning of Friday, Aug. 8, 2025 the Washington State Department of Transportation (WSDOT) announced.
The lane and ramp closures on I-5 will allow crews to install roadway signs.
The SR 516 lane and ramp closures will allow crews to perform electrical work.
The SR 509 ramp closures will allow contractor crews to perform paving work.
This work is part of the SR 509 Completion Project.
I-5 Lane Closure Information
Monday, Aug. 4 through the morning of Friday, Aug. 8:
- 11:30 p.m. to 4 a.m. – Up to two lanes of southbound I-5 will close nightly between South 200th Street/Military Road South (Exit 151) and SR 516 (Exit 149).
Wednesday, Aug. 6 through the morning of Friday, Aug. 8:
- 9 p.m. to 4 a.m. – Up to two lanes of northbound I-5 will close nightly between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
I-5 Ramp Closure Information
Monday, Aug. 4 through the morning of Friday, Aug. 8:
- 11:30 p.m. to 4 a.m. – The southbound I-5 exit to SR 516 will close nightly. A signed detour will be in place.
Tuesday, Aug. 5 through the morning of Friday, Aug. 8:
- 9:30 p.m. to 3:30 a.m. – The northbound I-5 exit to SR 516 will close nightly. A signed detour will be in place.
SR 516 Lane Closure Information
Monday, Aug. 4 through the morning of Friday, Aug. 8:
- 8 p.m. to 5 a.m. – Westbound SR 516 will close nightly between Military Road South and SR 99. A signed detour will be in place.
Monday, Aug. 4 through the morning of Wednesday, Aug. 6:
- 8 p.m. to 5 a.m. – One lane of eastbound SR 516 will close nightly between SR 99 and Military Road South.
SR 516 Ramp Closure Information:
Monday, Aug. 4 through the morning of Wednesday, Aug. 6:
- 2:30 a.m. to 5 a.m. – The SR 516 ramp to southbound I-5 will close nightly. A signed detour will be in place.
Tuesday, Aug. 5 through the morning of Friday, Aug. 8:
- 11:59 p.m. to 2:30 a.m. – The eastbound SR 516 ramp to northbound I-5 will close nightly. A signed detour will be in place.
SR 509 Ramp Closure Information
Monday, Aug. 4 through the morning of Thursday, Aug. 7:
- 7 p.m. to 5 a.m. – The westbound South 188th Street on-ramp to northbound SR 509 will close nightly.
Monday, Aug. 4 through the morning of Wednesday, Aug. 6:
- 8 p.m. to 5 a.m. – The South 188th Street exit from southbound SR 509 will close nightly.
Monday, Aug. 4 through the morning of Friday, Aug. 8:
- 9 p.m. to 5 a.m. – The South 160th Street on-ramp to southbound SR 509 will close nightly.
Wednesday, Aug. 6 through the morning of Friday, Aug. 8:
- 10:30 p.m. to 4 a.m. – The 24th Avenue South on-ramp to southbound SR 509 will close nightly.
Wednesday, Aug. 6 through the morning of Friday, Aug. 8:
- 10 p.m. to 5 a.m.– The southbound SR 509 exit to South 160th Street will close nightly.
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 between I-5 and 24th Avenue South opened on June 28 and a new tunnel under I-5 at the SR 516 interchange opened on July 16. The final stage builds the remaining 2 miles of the expressway between 24th Avenue South and South 188th Street. The entire project is planned for completion by 2029.
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. Together, the two completion projects finish critical missing links in Washington’s highway and freight network.
