Looking for the heart of construction to replace the Alaskan Way Viaduct? Look no further than the massive construction zone to the west of Seattle’s stadiums. This area will change frequently between now and the time the SR 99 tunnel opens to traffic.
Our interactive simulation shows you how the area will evolve as we continue replacing the viaduct.
Tunnel approach taking shape near stadiums
Just west of Seattle’s stadiums, crews are building the future northbound approach to the tunnel. The northbound tunnel portal will be in the vicinity of the black-and-white crane in the photo below:
South operations building ready to rise
Seattle Tunnel Partners is making great progress on the south operations building, which will sit on the south side of South King Street, just to the north of the tunnel entrance. Visible to northbound drivers, it will house maintenance vehicles, ventilation fans and emergency power when the tunnel opens to traffic. Much of the underground structural construction is complete, and crews are beginning to install electrical systems while the building rises above the surface. This post talks more about the tunnel's two operations buildings. A rendering of the south building is below.