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. Enlarge the photo below to see a rendering of the future south portal, where SR 99 will connect with the surrounding surface streets.
Last updated Dec. 11, 2015
A clear view of the future State Route 99
It’s getting easier to see the future of SR 99 near the stadiums. Seattle Tunnel Partners’ work on the northbound tunnel approach and portal is nearly complete. Crews are now focusing their attention on the future northbound on-ramp into the tunnel from South Royal Brougham Way.
South operations building progress
The SR 99 tunnel’s south portal operations building continues to take shape on the construction site west of the stadiums. The building is located south of South King Street and just west of SR 99. Visible to northbound drivers, it will house maintenance vehicles, ventilation fans and emergency power when the tunnel opens to traffic. STP installed the building's yellow ventilation stacks in July 2015 and will install the exterior glass wall of the ventilation fan room in early 2016. This post talks more about the tunnel's two operations buildings.