SR 99 South End Viaduct Replacement - The new State Route 99
These images show construction of the side-by -side roadway that will replace the southern mile of the Alaskan Way Viaduct in Seattle. Most of the new highway will be elevated, just like I-5 through downtown Seattle.

On the elevated section between S. Royal Brougham Way and S. Holgate Street, crews built the southbound roadway first, starting in early 2011. We opened the southbound roadway in October 2011. The southbound roadway will carry two lanes each of southbound and northbound traffic until the northbound roadway is complete.

Between S. Royal Brougham and S. King Street, drivers are traveling on a four-lane construction detour that connects the new roadway to the viaduct's downtown waterfront section. The detour will be in place until the SR 99 tunnel opens at the end of 2015.

Crews working for contractor Skanska began building the northbound roadway in fall 2011. The northbound lanes are scheduled to open in late 2012 or early 2013.

Learn more about our plan to replace the south end of the Alaskan Way Viaduct.
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