CA · County

San Mateo Car Accidents & Crashes

San Mateo County has recorded 3,292 traffic crashes since 2024, including 9 fatal incidents. In the last 24 hours, 19 new crashes were reported. Crash volume is highest on US-101 N/B and US-101 S/B.

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 May 29, 2026.

Breakdown by type: 902 accident.

902

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 902 results

902 accident

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

Moderate Accident

US-101 N 24 minutes ago

CHP : Disabled vehicle on US-101 Southbound north of Marsh Rd (Menlo Park). Lane affected. Expect delays.

Moderate Accident

US-101 S 2 hours, 39 minutes ago

CHP : Traffic Collision with Injuries on US-101 Southbound north of Whipple Ave (Redwood City). Lane blocked. Expect delays.

Moderate Accident

US-101 S 2 hours, 39 minutes ago

CHP : Traffic Collision on US-101 Northbound at Redwood Shores Pky (San Carlos). Lane affected. Expect delays.

Moderate Accident

US-101 N 1 day, 2 hours ago

CHP : Traffic Hazard on US-101 Northbound south of Willow Rd (Menlo Park). Lane affected. Expect delays.

Moderate Accident

US-101 N 1 day, 2 hours ago

CHP : Disabled tractor trailer on US-101 Northbound at E Hillsdale Blvd (San Mateo). Lane affected. Expect delays.

Moderate Accident

US-101 N 1 day, 3 hours ago

CHP : Traffic Hazard on I-280 Northbound north of CA-84 E (Woodside). Lane blocked. Expect delays.

Moderate Accident

I-280 N 1 day, 3 hours ago

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

Moderate Accident

I-280 S 1 day, 4 hours ago

CHP : Traffic Hazard on I-280 Southbound north of Farm Hill Blvd (Woodside). Center lanes affected. Expect delays.

Moderate Accident

I-280 S 1 day, 9 hours ago

CHP : Traffic Hazard on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Right lane blocked. Expect delays.

Moderate Accident

CA-92 W 1 day, 10 hours ago

CHP : Residual delays on US-101 Southbound at University Ave (East Palo Alto). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 1 day, 10 hours ago

CHP : Traffic Collision on I-280 Northbound south of CA-92 E (San Mateo). Lanes affected. Expect delays.

Moderate Accident

I-280 N 1 day, 12 hours ago

CHP : Vehicle fire on I-280 Northbound ramp to CA-92 E (San Mateo). Right shoulder affected. Expect delays.

Moderate Accident

I-280 N 2 days ago

CHP : Traffic Collision with Injuries on I-280 Northbound north of Alpine Rd (Menlo Park). Lane blocked. Expect delays.

Moderate Accident

I-280 N 2 days, 1 hour ago

CHP : Traffic Hazard on US-101 Northbound south of E 3RD Ave (San Mateo). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 N 2 days, 1 hour ago

CHP : Residual delays on US-101 Northbound exiting at Willow Rd (Menlo Park). Right shoulder affected. Expect delays.

Moderate Accident

US-101 N 2 days, 2 hours ago

CHP : Traffic Collision on US-101 Southbound north of Whipple Ave (Redwood City). Left lanes blocked. Expect delays.

Moderate Accident

US-101 S 2 days, 9 hours ago

CHP : Residual delays on US-101 Northbound south of Dore Ave (San Mateo). Right shoulder affected. Expect delays.

Moderate Accident

US-101 N 2 days, 11 hours ago

CHP : Traffic Hazard on CA-92 Eastbound east of Foster City Blvd (Foster City). Center lane blocked. Expect delays.

Moderate Accident

CA-92 E 2 days, 22 hours ago

CHP : Traffic Hazard on US-101 Southbound north of S Airport Blvd (South San Francisco). Lane affected. Expect delays.

Moderate Accident

US-101 S 3 days ago

CHP : Disabled vehicle on I-280 Northbound south of Sand Hill Rd (Menlo Park). Right lane blocked. Expect delays.

Moderate Accident

I-280 N 3 days ago

CHP : Traffic Collision on CA-92 Eastbound ramp to US-101 S (San Mateo). Lane affected. Expect delays.

Moderate Accident

CA-92 E 3 days ago

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

Moderate Accident

US-101 S 3 days, 1 hour ago

CHP : Traffic Collision on US-101 Southbound entering at E Millbrae Ave (Millbrae). Lane affected. Expect delays.

Moderate Accident

US-101 S 3 days, 2 hours ago

CHP : Traffic Hazard on I-280 Northbound south of Edgewood Rd (Unincorporated). Right and center lanes affected. Expect delays.

Moderate Accident

I-280 N 3 days, 2 hours ago

CHP : Traffic Hazard on US-101 Northbound south of Marsh Rd (Menlo Park). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 N 3 days, 2 hours ago

CHP : Traffic Hazard on I-280 Northbound south of Skyline Blvd (San Bruno). Left lane affected. Expect delays.

Moderate Accident

I-280 N 3 days, 3 hours ago

CHP : Traffic Hazard on I-280 Northbound south of San Bruno Ave W (San Bruno). Left lanes blocked. Expect delays.

Moderate Accident

I-280 N 3 days, 3 hours ago

CHP : Traffic Hazard on I-280 Southbound at Washington St (Daly City). Lane affected. Expect delays.

Moderate Accident

I-280 S 3 days, 4 hours ago

CHP : Traffic Collision with Injuries on US-101 Northbound north of San Bruno Ave E (San Bruno). Lane affected. Expect delays.

Moderate Accident

US-101 N 3 days, 4 hours ago

CHP : Brush fire on I-280 Southbound at Skyline Blvd (San Bruno). Right lane blocked. Expect delays.

Moderate Accident

I-280 S 3 days, 4 hours ago

CHP : Traffic Hazard on US-101 Southbound north of I-380 W (South San Francisco). Right lane blocked. Expect delays.

Moderate Accident

US-101 S 3 days, 10 hours ago

CHP : Traffic Hazard on CA-92 Westbound at San Mateo Bridge - High Rise (Foster City). Lane blocked. Expect delays.

Moderate Accident

CA-92 W 3 days, 12 hours ago

CHP : Traffic Collision with Injuries on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Lanes blocked. Expect delays.

Moderate Accident

US-101 S 3 days, 16 hours ago

CHP : Residual delays on I-280 Southbound north of John Daly Blvd (Daly City). Right lanes blocked. Expect delays.

Moderate Accident

I-280 S 4 days, 1 hour ago

CHP : Traffic Collision with Injuries on I-280 Southbound north of Alpine Rd (Menlo Park). Lane affected. Expect delays.

Moderate Accident

I-280 S 4 days, 2 hours ago

CHP : Traffic Collision on US-101 Southbound north of E Millbrae Ave (Millbrae). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 4 days, 4 hours ago

CHP : Traffic Hazard on US-101 Southbound entering at Woodside Rd (Redwood City). Center lanes blocked. Expect delays.

Moderate Accident

US-101 S 4 days, 6 hours ago

CHP : Disabled vehicle on US-101 Southbound exiting at E Hillsdale Blvd (San Mateo). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 S 4 days, 7 hours ago

CHP : Traffic Hazard on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Left lane affected. Expect delays.

Moderate Accident

US-101 S 4 days, 7 hours ago

CHP : Traffic Hazard on I-280 Southbound north of Washington St (Daly City). Lane affected. Expect delays.

Moderate Accident

I-280 S 4 days, 10 hours ago

CHP : Traffic Collision with Injuries on CA-92 Eastbound at I-280 S (San Mateo). Lanes blocked. Expect delays.

Moderate Accident

CA-92 E 4 days, 16 hours ago

CHP : Traffic Hazard on US-101 Northbound south of University Ave (East Palo Alto). Lanes affected. Expect delays.

Moderate Accident

US-101 N 4 days, 17 hours ago

CHP : Traffic Collision on US-101 Northbound west of Woodside Rd (Redwood City). Lane affected. Expect delays.

Moderate Accident

US-101 N 4 days, 20 hours ago

CHP : Traffic Hazard on US-101 Southbound north of E Millbrae Ave (Millbrae). Lane affected. Expect delays.

Moderate Accident

US-101 S 4 days, 20 hours ago

CHP : Traffic Hazard on US-101 Northbound south of E Millbrae Ave (Millbrae). Right lane blocked. Expect delays.

Moderate Accident

US-101 N 4 days, 21 hours ago

CHP : Disabled vehicle on I-280 Northbound north of CA-92 W (San Mateo). Lane blocked. Expect delays.

Moderate Accident

I-280 N 4 days, 22 hours ago

CHP : Traffic Collision on CA-92 Westbound at US-101 S (San Mateo). Lane affected. Expect delays.

Moderate Accident

CA-92 W 4 days, 22 hours ago

CHP : Disabled vehicle on US-101 Southbound south of University Ave (East Palo Alto). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 4 days, 22 hours ago

CHP : Residual delays on US-101 Northbound south of Woodside Rd (Redwood City). Right shoulder affected. Expect delays.

Moderate Accident

US-101 N 4 days, 23 hours ago