South End

South end

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.

Enlarge the photo below to see a rendering of the future south portal, where SR 99 will connect with the surrounding surface streets. 

South portal simulation, with labels

Last updated Aug. 22, 2016

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 off-ramp bridge from South Dearborn street.

South end portal


South operations building progress

The SR 99 tunnel’s south portal operations building, located south of South King Street and just west of SR 99, is nearing completion. Currently visible to drivers on the viaduct, it will house maintenance vehicles, ventilation systems and emergency power. The four bright yellow stacks are for strong ventilation fans for the future tunnel. This post talks more about the tunnel's two operations buildings. 

South portal operations building