SR 99 tunnel now open to traffic
The party was over, but after more than 100,000 people spent the weekend saying goodbye to the viaduct and hello to the new SR 99 tunnel, one very important event remained: the opening of the tunnel to drivers.
Crews began the tunnel opening sequence at approximately 10:30 p.m. Sunday. The first vehicle rolled through the tunnel's northbound lanes just after 11 p.m. and by 12:15 a.m. Monday, all ramps to and from the tunnel were open to drivers. The one exception is the new northbound off-ramp to South Dearborn Street, near the stadiums, which will take crews another one to two weeks to complete.
WSDOT, SDOT, Seattle Police and Washington State Patrol coordinated closely to ensure the tunnel was opened safely. Uniformed police officers will remain on hand at some entrances overnight to ensure continued safety.
Some intersections at the tunnel portals opened Sunday afternoon, including the intersections at South Dearborn Street, and the northbound entrance to SR 99 from Harrison Street. The new connection from Alaskan Way to East Marginal Way South also opened on Sunday. Learn more about the new intersections in this post. You can also watch these videos to better understand how to use the new tunnel.