Traffic alert: Closure over, as new northbound Highway 99 lanes open

Highway 99 between the West Seattle Bridge and downtown is open again in both directions, with this weekend’s closure ending early as crews finished connecting the new northbound section through SODO to the rest of the roadway. Ahead, the detailed announcement from WSDOT:

From Starbucks to Safeco Field, drivers are traveling on a new State Route 99 – an entire year earlier than expected.

At 5:07 p.m. Saturday, Sept. 15, crews opened newly completed northbound SR 99 lanes through SODO. This followed a weekend closure to connect existing SR 99 lanes to the second of two side-by-side bridges. Southbound traffic remains on the west bridge, which opened in October 2011, while the new east bridge now carries northbound traffic.

Crews completed this new section of SR 99 a year ahead of schedule and within the contract budget.

“The new SR 99 through SODO is a big upgrade over the seismically vulnerable viaduct, since these bridges meet the latest standards for earthquake safety,” said Matt Preedy, deputy administrator for the Washington State Department of Transportation’s Alaskan Way Viaduct Replacement Program. “Drivers will notice wider lanes and shoulders, and can help keep traffic moving by paying attention to signs and striping as they get used to the new configuration.”

The full benefit of the new lanes won’t be realized until they connect to the SR 99 tunnel at the end of 2015, Preedy said. Until then drivers will continue to use the curvy four-lane construction bypass between the new SR 99 and the remaining section of viaduct along the downtown waterfront.

What drivers can expect on the new SR 99
· Southbound SR 99: Drivers travel in two lanes through a construction bypass from South King Street to just south of South Atlantic Street. At South Atlantic Street, the road widens to three lanes with shoulders.
· Northbound SR 99: Drivers use newly completed lanes from the Starbucks building to just south of South Atlantic Street. This section has three lanes, with the right lane reserved for buses. The bus lane ends south of South Atlantic Street, and the remaining two lanes shift west and connect to the construction bypass.
· Construction bypass: The 25 mph advisory speed limit remains in effect on the SR 99 construction bypass that curves traffic around the giant SR 99 tunnel construction site. The bypass will stay in operation until the tunnel opens in late 2015.
For more information about the Alaskan Way Viaduct Replacement Program, visit
Hyperlinks within the news release:
· new SR 99 photo
· Map of SR 99 changes

5 Replies to "Traffic alert: Closure over, as new northbound Highway 99 lanes open"

  • Robert2715 September 15, 2012 (7:48 pm)

    What, no Video WSB? :-)

    • WSB September 15, 2012 (7:52 pm)

      Going to have to wait till morning. It’ll be light enough before we go spend the day boothing at the car show. P.S. Come by, say hi, we have first-come first-served freebies, first time ever. – TR

  • Dale September 15, 2012 (9:04 pm)

    Yes, I feel WSB is our adult babysiters. Thanks.

  • JanS September 15, 2012 (10:04 pm)

    cool…everyone can take a dry run :)

  • Rachelle September 16, 2012 (2:47 pm)

    I drove on the new north bound portion. It’s nice to have wider lanes for longer but since it’s still a bus lane on the right I don’t think it will provide any relief to the morning commute (for cars). Bus riders will be happy to have a longer bus lane all to themselves.

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