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 this area will evolve as we continue replacing the viaduct.
South Atlantic Street overpass open to traffic
On Monday, Jan. 27, we opened a new overpass to the west of Seattle’s stadiums. The overpass allows traffic to bypass a busy railroad track that crosses South Atlantic Street. Before the overpass, train activity often blocked traffic for extended periods, which not only slowed truckers traveling to and from the Port of Seattle, but also created backups that stretched onto Seattle streets and Interstate 90. The overpass saves truckers as much as 20 minutes of travel time between the port and I-5 or I-90.
The section of Atlantic beneath SR 99 will remain closed to through traffic until the SR 99 tunnel opens to traffic. Drivers will now use the new overpass to travel in both directions between Atlantic and Alaskan Way South.
Later this winter, crews will complete improvements to the bicycle and pedestrian path on the west side of SR 99 between Atlantic and South King streets.
The north leg of the overpass will open to the public after the tunnel opens and will eventually link traffic to the new Alaskan Way and Seattle waterfront.
- View a detailed map (pdf 593 kb) of how vehicles, bicycles and pedestrians travel on the overpass
- View a map that shows how traffic in the area will change (pdf 1.2 Mb) between now and when the SR 99 tunnel opens
The new SR 99 through SODO
Good news: The southern mile of the viaduct has officially been replaced. Even better news: crews finished one year early and on budget.
Unlike the double-deck viaduct, this new section of SR 99 features twin, side-by-side bridges. As of September 2012, northbound traffic is using the newly completed east-side bridge. Southbound traffic remains on the west-side bridge that was completed in October 2011.
Our south-end SR 99 map (pdf 4 MB) shows you what the new section of highway looks like, and how the area will continue to change as crews build the SR 99 tunnel and a new overpass at South Atlantic Street. Our time-lapse video zips you through 11 months of construction in 2 minutes and 10 seconds, or you can check out how construction looks right now by taking a look at our construction cameras.