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San Mateo Car Accidents & Crashes

San Mateo County has recorded 4,584 traffic crashes since 2024, including 9 fatal incidents. In the last 24 hours, 30 new crashes were reported. Crash volume is highest on US-101 N/B and US-101 N.

Data is sourced from the California Crash Records System (CCRS), maintained by the California Highway Patrol and updated daily, and the CA 511 live incident feed, refreshed every 15 minutes. CCRS records include party details, injury severity, vehicle information, and precise geographic coordinates. Last updated July 29, 2026.

Breakdown by type: 439 accident, 127 construction.

566

Total Crashes

Filtered results

0

Fatalities

Fatal injury reports

1

Today

Reported since midnight

Today's Accidents Today's Fatalities

showing most recent 500 incidents with location data · click a marker to view details

Crash Records

San Mateo Incidents 566 results

439 accident 127 construction

CHP : Traffic Hazard on US-101 Northbound entering at Woodside Rd (Redwood City). Right lane affected. Expect delays.

Moderate Accident

US-101 N 35 minutes ago

Caltrans : Roadwork on CA-1 Northbound and Southbound at Swanton Rd (Unincorporated). Lane closed. One way traffic control in effect. From 7:00 AM Wednesday, July 29, 2026 to 5:00 PM Wednesday, July 29, 2026.

CA-1 S 35 minutes ago

CHP : Residual delays on US-101 Southbound north of E Poplar Ave (San Mateo). All lanes open. Expect delays.

US-101 S 1 hour, 35 minutes ago

CHP : Traffic Collision with Injuries on CA-35 Northbound at Alpine Rd (Unincorporated). Lane affected. Expect delays.

Moderate Accident

CA-35 N 7 hours, 20 minutes ago

CHP : Residual delays on US-101 Southbound north of E Hillsdale Blvd (San Mateo). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 8 hours, 20 minutes ago

CHP : Traffic Collision on US-101 Northbound south of Kehoe Ave (San Mateo). Left lane blocked. Expect delays.

Moderate Accident

US-101 N 10 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 35 minutes ago

Caltrans : Roadwork on CA-1 Northbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

CA-1 N 11 hours, 35 minutes ago

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 7 AM. From 7:00 PM Tuesday, July 28, 2026 to 7:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 35 minutes ago

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Northbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 8:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 N 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 S 11 hours, 50 minutes ago

Caltrans : Roadwork on CA-1 Northbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-1 N 12 hours, 5 minutes ago

Caltrans : Roadwork on US-101 Northbound between CA-92 E (San Mateo) and E 3RD Ave (San Mateo). Various lanes closed until 5 AM. From 10:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

US-101 N 13 hours, 50 minutes ago

Caltrans : Roadwork on CA-82 Northbound between I-380 W (San Bruno) and S Spruce Ave (South San Francisco). Lanes closed until 6 AM. From 10:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-82 N 13 hours, 50 minutes ago

Caltrans : Roadwork on US-101 Southbound between CA-92 E (San Mateo) and E Hillsdale Blvd (San Mateo). Various lanes closed until 5 AM. From 8:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

US-101 S 13 hours, 50 minutes ago

Caltrans : Roadwork on US-101 Southbound between Broadway (Burlingame) and E Poplar Ave (San Mateo). Various lanes closed until 5 AM. From 11:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

US-101 S 13 hours, 50 minutes ago

Caltrans : Roadwork on US-101 Southbound between Woodside Rd (Redwood City) and Marsh Rd (Menlo Park). Various lanes closed until 5 AM. From 9:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

US-101 S 13 hours, 50 minutes ago

Caltrans : Roadwork on CA-82 Southbound between John Daly Blvd (Daly City) and School St (Daly City). Various lanes closed until 6 AM. From 8:00 PM Tuesday, July 28, 2026 to 6:00 AM Wednesday, July 29, 2026.

CA-82 S 14 hours, 5 minutes ago

Caltrans : Roadwork on I-280 Northbound between John Daly Blvd (Daly City) and King St (San Francisco). Lane closed until 3 AM. From 9:00 PM Tuesday, July 28, 2026 to 3:00 AM Wednesday, July 29, 2026.

I-280 N 19 hours, 35 minutes ago

Caltrans : Roadwork on US-101 Northbound between Anza Blvd (Burlingame) and Broadway (Burlingame). Lanes closed until 4 AM. From 9:00 PM Tuesday, July 28, 2026 to 4:00 AM Wednesday, July 29, 2026.

US-101 N 19 hours, 35 minutes ago

Caltrans : Roadwork on CA-82 Northbound at CA-84 (Redwood City). Lane closed until 5 AM. From 9:00 PM Tuesday, July 28, 2026 to 5:00 AM Wednesday, July 29, 2026.

CA-82 N 19 hours, 35 minutes ago

CHP : Traffic Hazard on I-280 Southbound north of I-280 S-CA-1 S Join (Daly City). Lane affected. Expect delays.

Moderate Accident

I-280 S 21 hours, 5 minutes ago

Caltrans : Roadwork on I-380 Eastbound ramp to US-101 S (South San Francisco). Left lanes closed. Expect delays. From 5:00 PM Tuesday, July 28, 2026 to 8:30 PM Tuesday, July 28, 2026.

I-380 E 21 hours, 5 minutes ago

CHP : Traffic Hazard on US-101 Southbound north of Airport Exit (Millbrae). Left lane affected. Expect delays.

Moderate Accident

US-101 S 21 hours, 20 minutes ago

CHP : Severe traffic alert and Traffic Collision on US-101 Northbound south of Dore Ave (San Mateo). Left lanes blocked. Expect delays.

US-101 N 22 hours, 5 minutes ago

CHP : Traffic Collision on US-101 Northbound south of CA-92 E (San Mateo). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 N 22 hours, 20 minutes ago

CHP : Traffic Collision on US-101 Northbound north of E 3RD Ave (San Mateo). Left lanes blocked. Expect delays.

Moderate Accident

US-101 N 23 hours, 50 minutes ago

CHP : Traffic Hazard on I-280 Southbound north of I-280 S-CA-92 W Ramp (San Mateo). Center lanes affected. Expect delays.

Moderate Accident

I-280 S 1 day ago

CHP : Traffic Hazard on US-101 Northbound south of San Bruno Ave E (San Bruno). Lane affected. Expect delays.

Moderate Accident

US-101 N 1 day ago

Caltrans : Roadwork on CA-1 Southbound at Bonny Doon Rd (Unincorporated). Lane closed. One way traffic control in effect. From 7:00 AM Tuesday, July 28, 2026 to 5:00 PM Tuesday, July 28, 2026.

CA-1 S 1 day, 1 hour ago

CHP : Traffic Collision on US-101 Southbound entering at CA-92 E (San Mateo). On Ramp blocked. Expect delays.

US-101 S 1 day, 7 hours ago

CHP : Traffic Hazard on US-101 Southbound north of E Hillsdale Blvd (San Mateo). Right lane affected. Expect delays.

Moderate Accident

US-101 S 1 day, 9 hours ago

CHP : Traffic Hazard on US-101 Northbound south of Broadway (Burlingame). Left lane blocked. Expect delays.

Moderate Accident

US-101 N 1 day, 10 hours ago

CHP : Traffic Hazard on US-101 Southbound north of E 3RD Ave (San Mateo). Right lanes blocked. Expect delays.

Moderate Accident

US-101 S 1 day, 10 hours ago

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 7 AM. From 7:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 11 hours ago

Caltrans : Roadwork on CA-1 Northbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

CA-1 N 1 day, 11 hours ago

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 7 AM. From 6:00 PM Monday, July 27, 2026 to 7:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 11 hours ago

Caltrans : Roadwork on CA-82 Southbound between John Daly Blvd (Daly City) and School St (Daly City). Various lanes closed until 6 AM. From 8:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-82 S 1 day, 11 hours ago

Caltrans : Roadwork on CA-1 Northbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 8:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-1 N 1 day, 11 hours ago

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 13 hours ago

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 13 hours ago

CHP : Traffic Hazard on I-380 Eastbound west of US-101 S (South San Francisco). Lane affected. Expect delays.

Moderate Accident

I-380 E 1 day, 13 hours ago

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 13 hours ago

Caltrans : Roadwork on CA-1 Southbound at Capistrano Rd (El Granada). Lane closed until 6 AM. From 10:00 PM Monday, July 27, 2026 to 6:00 AM Tuesday, July 28, 2026.

CA-1 S 1 day, 13 hours ago

Caltrans : Roadwork on US-101 Northbound between CA-92 E (San Mateo) and E 3RD Ave (San Mateo). Various lanes closed until 5 AM. From 10:00 PM Monday, July 27, 2026 to 5:00 AM Tuesday, July 28, 2026.

US-101 N 1 day, 14 hours ago

Caltrans : Roadwork on US-101 Southbound between CA-92 E (San Mateo) and E Hillsdale Blvd (San Mateo). Various lanes closed until 5 AM. From 8:00 PM Monday, July 27, 2026 to 5:00 AM Tuesday, July 28, 2026.

US-101 S 1 day, 14 hours ago