The new SR 99 tunnel under Seattle
New route through Seattle
The SR 99 tunnel will provide a direct route from the stadiums to the Space Needle. When the tunnel opens, drivers will have new options for getting to and around downtown Seattle.
Learn how routes will change >
The tunnel is part of WSDOT's program to replace the Alaskan Way Viaduct. Viaduct demolition and the filling of the Battery Street Tunnel will begin shortly after the new tunnel opens to drivers.
Read more about demolition >