Overnight lane and ramp closures on I-5 and SR 516 in the Kent, Des Moines, and SeaTac areas continue this week, from Monday, Mar. 10 through the morning of Friday, Mar. 14, 2025.
The closures on I-5 will allow contractor crews working for the Washington State Department of Transportation to install concrete barriers and stripe the roadway.
This work is part of the SR 509 Completion Project.
I-5 lane closure information
Monday, March 10 through the morning of Tuesday, March 11:
- 8 p.m. to 4:30 a.m. – Up to two lanes of northbound I-5 will close overnight between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
Tuesday, March 11 through the morning of Wednesday, March 12:
- 11:59 p.m. to 3:30 a.m. – Up to four lanes of northbound I-5 will close overnight between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
Wednesday, March 12 through the morning of Thursday, March 13:
- 8 p.m. to 4:30 a.m. – Up to two lanes of northbound I-5 will close overnight between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
I-5 ramp closure information
Monday, March 10 through the morning of Friday, March 14:
- 9:30 p.m. to 3:30 a.m. – The northbound I-5 to westbound SR 516 on-and off-ramps will close nightly. A signed detour will be in place.
SR 516 lane closure information
Monday, March 10 through the morning of Tuesday, March 11:
- 8 p.m. to 4:30 a.m. – One lane of westbound SR 516 will close overnight between SR 99 and Military Road South.
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 is scheduled to open in summer 2025 along with the new Veterans Drive tunnel at the SR 516 interchange. 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.
