Washington State Department of Transportation
Northwest Region – 15700 Dayton Avenue – Shoreline, WA 98133 – 206-440-4000
TRAVEL ADVISORY
Feb. 18, 2025
Contact: Elizabeth Mount, communications, 206-482-2276
SR 99 tunnel in Seattle to close in both directions Friday night, Feb. 21
SEATTLE – Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, Feb. 21, to 6 a.m. Saturday, Feb. 22, for maintenance.
Washington State Department of Transportation will start closing northbound and southbound lanes at 9 p.m., with the tunnel fully closed by 10 p.m. Drivers going south on SR 99 will need to take the Harrison Street off-ramp, and northbound SR 99 drivers will need to take the Alaskan Way off-ramp. Also, the Sixth Avenue and Royal Brougham Way on-ramps will close at 9 p.m.
The closure will let crews do several important tasks, including:
- Fire suppression testing.
- Cleaning and marking drains.
- Fixing lights.
People traveling through downtown Seattle Friday night should use alternate routes. For up-to-date traffic information use the WSDOT mobile app and the real-time travel map.
Hyperlinks within the release:
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WSDOT keeps people, businesses and the economy moving by operating and improving the state's transportation systems. To learn more about what we're doing, go to www.wsdot.wa.gov/news for pictures, videos, news and blogs. Real time traffic information is available at wsdot.com/traffic.
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