SEATTLE — Starting on December 1, the State Route 99 tunnel will be closed in both directions for scheduled maintenance.
The closure will last until 6 a.m. on Saturday.
Crews will inspect fire extinguishers and fire sprinkler visual inspections. They will also lubricate and test the jet fans, and fix the tunnel lighting along with other repairs.
FULL SR 99 TUNNEL CLOSURE FRIDAY IN SEATTLE
— WSDOT Traffic (@wsdot_traffic) November 30, 2023
Both directions of the SR 99 tunnel in Seattle will close for scheduled maintenance 10 p.m. Friday, Dec. 1 until 6 a.m. Saturday, Dec. 2.@SDOTtraffic @seattledot https://t.co/wQ9wFd4CVq pic.twitter.com/jvAgLQMKhY
Further south, I-405 southbound will close between Monday Dec. 4 and Thursday Dec. 7 at 11 p.m. The roadway will reopen at 4:30 a.m. each morning. This will be to set new girders for an overpass that was torn down when it was damaged by a semi-truck trailer.
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