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Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, Feb. 6, to 6 a.m. Saturday, Feb. 7, for maintenance.
Washington State Department of Transportation (WSDOT) maintenance crews will start closing northbound and southbound lanes at 8:30 p.m. Friday, Feb. 6, with the tunnel fully closed by 10 p.m. People going south on SR 99 will need to take the Harrison Street off-ramp, while northbound SR 99 travelers 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:
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- Testing fire suppression systems
- 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.
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