Viaduct demolition returns to South Dearborn Street Sept. 12

Posted on Aug 30 2019 9:45 AM

As crews removed the viaduct along Alaskan Way this spring and summer, two small sections were left standing at South Dearborn Street. WSDOT and our contractor Kiewit left these two sections in place in order to coordinate the timing of their removal with our partner agencies.

With demolition in its home stretch, we are ready to remove the viaduct over South Dearborn Street. On Thursday, Sept. 12, crews will close South Dearborn Street and narrow First Avenue South to two lanes on either side of the intersection to create a safe work zone. South Dearborn Street will be closed for up to ten days while crews remove the viaduct overhead.

Aerial of South Dearborn Street with viaduct section highlighted

Caption: The two remaining sections of viaduct (in orange) at South Dearborn Street may not look big, but removing them is complex work due to the many underground utilities that criss-cross the area.

We and our partner agencies are very aware of how critical First Avenue South and South Dearborn Street are for bus riders and drivers heading to and from SR 99 and points south and west of downtown. Some King County Metro buses will reroute while South Dearborn Street is closed and our contractor Kiewit will pull their work zone back from Alaskan Way so the street has its full four lanes open during this closure.

This closure will cause unavoidable disruptions to traffic and we ask drivers to make a plan for their trips: consider alternate routes or ways of getting around, including exiting SR 99 at Spokane Street, using transit or taking the King County Water Taxi. Next month will also bring demolition to the section of viaduct around Marion Street and changes for passengers arriving at Colman Dock. This construction is just one component of the #SeattleSqueeze as Seattle updates its transportation infrastructure to match the city’s mobility needs.

Order: 1.6