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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 (WSDOT) 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.
– Drain cleaning and marking
– Light fixing
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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