Early warning: Upcoming SR 99/Aurora Avenue North closures, Dec and Jan

Washington State Department of Transportation

Construction at the SR 99 tunnel’s future north portal will require traffic closures in December and January. Current information about these closures is below. We encourage travelers to plan ahead.

 Full closure Dec. 18-19
SR 99/Aurora Avenue North will be closed between the south end of the Battery Street Tunnel and Valley Street, Dec. 18-19.
During this closure, contractor crews working for the Washington State Department of Transportation will set up a work zone between the northbound and southbound SR 99 lanes near Harrison Street in order to build the permanent median barrier.
The southbound right lane of SR 99 in this area will be closed overnight the week prior, Dec. 14-17, as crews prepare for a variable message sign that will be installed during the weekend’s closure.
Closure details 
The right lane of southbound SR 99 will be closed between Roy and Mercer streets 8 p.m. to 6 a.m. nightly, Monday, Dec. 14 through Thursday, Dec. 17 and Monday, Dec. 21 through Tuesday, Dec. 22.
SR 99/Aurora Avenue North will be closed between the south end of the Battery Street Tunnel and Valley Street:
  • Northbound lanes: Closed from 9 p.m. Friday, Dec. 18 to 5 p.m. Saturday, Dec. 19
  • Southbound lanes: Closed from 9 p.m. Friday, Dec. 18 to 7 a.m. Saturday, Dec. 19. One southbound lane will remain closed until 1 p.m. Saturday, Dec. 19

Long-term lane closures beginning mid-January 

Contractor crews will install the foundations for new overhead traffic signs on SR 99/Aurora Avenue North between Highland Drive and the Aurora Bridge. One lane in each direction will be closed around the clock for approximately seven weeks. An additional lane will be closed at night when there is less traffic on the road and on some weekends to provide additional work zone for the contractor. One lane will remain open during this work.
These closures are necessary for crews to perform the work in a safe and efficient manner. Travelers should plan ahead and prepare for increased congestion on SR 99/Aurora Avenue North. The project team will be sharing more information in advance of this work to help travelers prepare.