California Department of Transportation
07/14/2026 | Press release | Distributed by Public on 07/14/2026 16:39
State Route 1-Tom Lantos (Devil’s Slide) Tunnels Full Overnight Closure
State Route 1-Tom Lantos (Devil's Slide) Tunnels Full Overnight Closure
Published: Jul 14, 2026
Saturday, August 15, 8 p.m. - 5 a.m.
San Mateo County ― Caltrans will test power sub-stations in the two bores of the State Route 1 (SR-1) Tom Lantos (Devil's Slide) Tunnels south of Pacifica. The testing will take place overnight starting on Saturday, August 15 and will finish on Sunday, August 16. For the safety of both crews and the public, both the northbound and southbound lanes will be closed.
Schedule
Lanes close: Saturday, August 15 at 8 p.m.
Lanes open: Sunday, August 16 at 5 a.m.
Detours
Heading southbound from Pacifica
From SR-1, exit at Sharp Park Road north towards Skyline Blvd. Turn right at Skyline Blvd. continuing to southbound I-280. Follow I-280 and exit on SR-92 west to Half Moon Bay.
Heading northbound from Half Moon Bay
Take eastbound SR-92 and enter northbound I-280. Exit at Skyline Blvd. and follow the road to Sharp Park Road. Turn left on Sharp Park Road and follow it to SR-1.
All work is weather dependent. Please drive with caution. Thank you for your patience as we work to maintain our state's highways, bridges, and tunnels.
For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.
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California Department of Transportation published this content on July 14, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on July 14, 2026 at 22:39 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]