WSDOT Travel Advisory: SR 99 tunnel in Seattle to close in both directions Friday night, Dec. 6

Washington State Department of Transportation
Northwest Region – 15700 Dayton Avenue – Shoreline, WA 98133 – 206-440-4000

TRAVEL ADVISORY    
Dec. 3, 2024

Contact:          Elizabeth Mount, communications, 206-482-2276

SR 99 tunnel in Seattle to close in both directions Friday night, Dec. 6

SEATTLE – Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, Dec. 6, to 6 a.m. Saturday, Dec. 7, for maintenance.

The Washington State Department of Transportation will start closing northbound and southbound lanes at 9 p.m., with the tunnel fully closed by 10 p.m. Drivers going south on SR 99 will need to take the Harrison Street off-ramp, and northbound SR 99 drivers will need to take the Alaskan Way off-ramp. Also, the Sixth Avenue and Royal Brougham Way on-ramps will close at 9 p.m.

The closure will let crews do several important tasks, including:

  • Cleaning drains.
  • Lubing tunnel fans.
  • Cleaning safety areas.
  • Checking fire extinguishers.
  • Testing data switches.
  • Replacing coaxial cable connections.
  • Troubleshooting dampers.
  • Fixing lights.
  • Repairing cameras.
  • Fixing message signs.

People traveling through downtown Seattle Friday night should use alternate routes. For up-to-date traffic information use the WSDOT mobile app and the real-time travel map.

Hyperlinks within the release:

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