The SR 99 tunnel replaced the Alaskan Way Viaduct along Seattle's central waterfront, carrying State Route 99 beneath downtown Seattle. The 2-mile tunnel opened to drivers in February 2019.
What to expect
The SR 99 Tunnel is open to drivers. The tunnel is a tolled facility with rates changing on a fixed schedule, depending on the time of day. Drivers with Good To Go! passes pay the lowest rates.