Weekend closure coming to northbound SR 99 lane and ramp near Seattle’s stadiums

Posted on Feb 20 2014 12:00 PM

Drivers can expect an assortment of closures this weekend on or near State Route 99 at the south end of downtown Seattle.

The closures signal changes coming to the routing of SR 99 lanes and ramps around the SR 99 tunnel construction zone west of the stadiums. Crews working for Seattle Tunnel Partners and WSDOT are moving the South Royal Brougham on-ramp to northbound SR 99 closer to First Avenue South. This weekend’s closures will help them build a section of the new ramp alignment.

Closure details

  • The South Royal Brougham Way on-ramp to northbound SR 99 will be closed from 7 a.m. Saturday, Feb. 22, to 5 a.m. Monday, Feb. 24.
  • The right lane of northbound SR 99 will be closed at South Royal Brougham Way from 7 a.m. Saturday, Feb. 22, to 5 a.m. Monday, Feb. 24.
  • The right lane of southbound First Avenue South will be closed from Railroad Way South to just north of South Royal Brougham Way from 7 a.m. Saturday, Feb. 22, to 5 a.m. Monday, Feb. 24.


Crews will shift traffic onto the rerouted South Royal Brougham Way on-ramp by early spring. It’s the first step in a major traffic shift for the four-lane bypass that takes traffic around the SR 99 tunnel construction zone. 

By this summer the bypass will split in two, with northbound SR 99 moving east and southbound SR 99 moving west. The traffic shift will provide space between both directions of the bypass for crews to continue building lanes and ramps into and out of the SR 99 tunnel.