Southbound SR 99 to close through Seattle during the first full weekend in June

Posted on May 30 2014 4:47 PM

Seattle Tunnel Partners crews will close all lanes of southbound State Route 99 during the first full weekend in June to shift traffic to a new southbound routing (pdf 769 Kb) of the highway near Seattle’s stadiums.

Closure details

  • Crews will close all lanes of southbound SR 99 between Denny Way and South Spokane Street from 10 p.m. Friday, June 6 to 5 a.m. Monday, June 9.
  • The right lane of southbound SR 99 between South King and South Atlantic streets and the southbound SR 99 off-ramp to South Atlantic Street will close earlier, at 7 p.m. Friday, June 6.


Crews will complete a similar shift of the northbound lanes during the June 20-23 weekend. The shifts will make room for STP to continue construction of lanes and ramps that will connect to the SR 99 tunnel. A fuller description of this work is available here.

Traffic will stay in the new configuration until the tunnel opens to traffic. Drivers should expect initial congestion and delays after each traffic shift as travelers adjust to the new routings. Drivers can help keep traffic moving by keeping an eye on the road and other drivers.