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  5. Nighttime SB U.S. 101 to Fashion Island Blvd. detour August 25 - October 25

Nighttime SB U.S. 101 to Fashion Island Blvd. detour August 25 - October 25

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To access Fashion Island Blvd from southbound 101:

  • During the day: take westbound SR-92 to the Fashion Island Blvd. off-ramp.
  • At night: take eastbound SR-92 to Mariner's Island Blvd.

San Mateo County ― Caltrans will be implementing an overnight detour to the Fashion Island Blvd. off-ramp from southbound U.S. 101 so that crews can construct bridge column foundations. The nightly detour will be in place from August 25 through October 25, 2025 between the hours of 8:00 p.m. and 5 a.m. To access Fashion Island Blvd from southbound U.S. 101, drivers should take eastbound SR-92 and exit at Mariner's Island Blvd. and then turn right to access Fashion Island Blvd.

This work is part of the $45M U.S. 101- SR-92 Short-term Improvements Project that is co-sponsored by the San Mateo County Transportation Authority and City/County Association of Governments. The project will bring operational improvements, enhancement to local access, and promotion of economic vitality to the region.

Detour 2 map Southbound 101 to Fashion Island Blvd. Motorists are advised to take the off-ramp to Eastbound SR-92 and turn right onto Edgewater Blvd. Then they will turn left onto Northbound Mariners Island Blvd to Fashion Island Blvd, for ramp closures on Southbound U.S. 101 at the SR-92 Interchange in Foster City,

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.