Accident High Severity Resolved

CHP : Traffic Hazard on I-680 Southbound entering at Stone Valley Rd (Alamo). On Ramp blocked. Expect delays.

A high-severity accident was reported on I-680 S near Contra Costa on October 6, 2026 at 9:46 PM.

Road

I-680 S

Area

Contra Costa

Address

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Started

Oct 6, 2:46 PM

Last Updated

2 weeks, 6 days ago

Oct 6, 3:45 PM

Resolved

Oct 6, 10:00 PM

Coordinates

37.8480, -122.0280

Update History

2 observations

CHP : Traffic Hazard on I-680 Southbound entering at Stone Valley Rd (Alamo). On Ramp blocked. Expect delays. Oct 6, 3:30 PM

CHP : Traffic Hazard on I-680 Southbound entering at Stone Valley Rd (Alamo). On Ramp blocked. Expect delays. Oct 6, 3:15 PM

Source: 511_sfbay · ID 511.org/1559860 First seen Oct 6, 2026 3:15 PM