SR 99 tunnel in Seattle to close in both directions Friday night, Feb. 21
The State Route 99 tunnel in Seattle will be closed in both directions from 10 p.m. on February 21 to 6 a.m. on February 22 for essential maintenance work, including fire suppression testing and drain cleaning. Drivers are advised to take alternate routes and utilize the WSDOT mobile app for real-time traffic updates.