SR 99 tunnel in Seattle to close in both directions Friday night, Feb. 21
The State Route 99 tunnel in Seattle will close in both directions for maintenance from 10 p.m. on February 21 to 6 a.m. on February 22. Drivers are advised to use alternate routes, as fire suppression testing, drain cleaning, and light repairs will be conducted during the closure. For real-time traffic updates, travelers can utilize the WSDOT mobile app.