Date: June 16, 2026

District: District 4 

Contact: Jeneane Crawford

Phone: 510-390-3253

SAN MATEO COUNTY ― Caltrans has scheduled intermittent ramp and lane closures of U.S. 101 in San Mateo County so that crews can perform lane striping, guardrail, and electrical work. This phase of the work will continue through Friday, July 3.

Intermittent Nighttime Lane Closures

9 pm. - 5 a.m. on the following weeknights

• Wednesday, June 17 and Thursday, June 18
• Tuesday June 23, Wednesday June 24, and Friday June 26
• Monday June 29, Thursday July 2, and Friday, July 3

Intermittent Daytime Ramp Closures

Partial ramp closures will continue within the project limits between South San Francisco and East Palo Alto from 7 a.m. to 5 p.m. so that crews can perform curb ramp upgrades.

Drivers should follow posted detour signs when ramps are closed.

Crews performing guardrail and paving work.

This work is part of the $177M U.S. 101 (San Mateo County) Multi-Asset Rehabilitation & Roadside Safety Project. The project scope includes paving, guardrail improvements, transportation management system enhancements, drainage upgrades, and Americans with Disabilities Act-compliant curb ramps. The project will bring operational improvements and promote economic vitality in the region. The project is funded by the State’s Highway Operation and Protection Plan (SHOPP), a “fix-it-first” program that funds California highway repair and preservation.


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 real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/