Accident
High Severity
Stale
CHP : Severe traffic alert and Traffic Collision with Injuries on I-680 Northbound south of Stone Valley Rd (Alamo). Right and center lanes blocked. Expect delays.
A high-severity accident was reported on I-680 N near Contra Costa on August 21, 2026 at 12:20 AM.
Last Updated
24 minutes ago
Aug 20, 6:30 PM
Coordinates
37.8445, -122.0236
Update History
3 observations
CHP : Severe traffic alert and Traffic Collision with Injuries on I-680 Northbound south of Stone Valley Rd (Alamo). Right and center lanes blocked. Expect delays.
Aug 20, 6:00 PM
CHP : Traffic Collision with Injuries on I-680 Northbound south of Stone Valley Rd (Alamo). Right and center lanes blocked. Expect delays.
Aug 20, 5:45 PM
CHP : Traffic Collision with Injuries on I-680 Northbound south of Stone Valley Rd (Alamo). Left and center lanes blocked. Expect delays.
Aug 20, 5:30 PM
Source: 511_sfbay · ID 511.org/1538535
First seen Aug 20, 2026 5:30 PM