Caltrans to close Caldecott Tunnel bores overnight for maintenance, starting Tuesday

FILE --Caltrans announced plans to close individual bores overnight during the week, for some scheduled fire extinguisher inspections. FILE --Caltrans announced plans to close individual bores overnight during the week, for some scheduled fire extinguisher inspections. Photo: Lance Iversen, The Chronicle Photo: Lance Iversen, The Chronicle Image 1 of / 3 Caption Close Caltrans to close Caldecott Tunnel bores overnight for maintenance, starting Tuesday 1 / 3 Back to Gallery

Those who drive through the Caldecott Tunnel at night might face some unexpected delays this week, as Caltrans plans to shut down the various four bores this week for tunnel maintenance, the agency announced.

Caltrans will close one bore each night this week from Tuesday, Dec. 3 to Tuesday, Dec. 10, from 9:30 p.m. to 4:30 a.m. each night (excluding weekends). The purpose is to "conduct annual fire extinguisher inspections in all four Caldecott bores," Caltrans said in a press release.

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The first of the closures is set to begin Tuesday night, weather permitting, and all of the closures will follow these same hours. In case of rain this week — which seems likely, according to weather reports — the closure could be rescheduled for another time, Caltrans warned.

Here's the schedule for the closures, as it stands currently:

Dec. 3-4, 9:30 p.m. to 4:30 a.m. — SR-24 Eastbound, Bore #1 closed

Dec. 4-5, 9:30 p.m. to 4:30 a.m. — SR-24 Eastbound, Bore #2 closed

Dec. 5-6, 9:30 p.m. to 4:30 a.m. — SR-24 Westbound, Bore #3 closed

Dec. 10-11, 9:30 p.m. to 4:30 a.m. — SR-24 Westbound, Bore #4 closed

Message signs will warn of the tunnel closures during the week, as well as directional signs showing detour information, Caltrans said.

Dianne de Guzman is a Digital Editor at SFGATE. Email: dianne.deguzman@sfgate.com