Washington State Department of Transportation
Northwest Region – 15700 Dayton Avenue – Shoreline, WA 98133 – 206-440-4000
TRAVEL ADVISORY
Sept. 29, 2025
Contact: Elizabeth Mount, communications, 206-482-2276
SR 99 tunnel to close in both directions Friday night, Oct. 3, in Seattle for maintenance
SEATTLE – Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, Oct. 3, to 6 a.m. Saturday, Oct. 4, for maintenance.
Washington State Department of Transportation maintenance crews will start closing northbound and southbound lanes at 8:30 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 must exit at Alaskan Way. The Sixth Avenue and Royal Brougham Way on-ramps also will close at 9 p.m.
Crews will perform several important tasks during the closure, 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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