Accident High Severity Active

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

A high-severity accident was reported on I-680 S near Contra Costa on August 9, 2026 at 9:30 AM.

Road

I-680 S

Area

Contra Costa

Address

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Started

Aug 9, 2:30 AM

Last Updated

4 minutes ago

Aug 9, 4:15 AM

Coordinates

37.8524, -122.0291

Update History

2 observations

CHP : Traffic Hazard on I-680 Southbound at Stone Valley Rd (Alamo). Off Ramp blocked. Expect delays. Aug 9, 2:45 AM

CHP : Traffic Hazard on I-680 Southbound at Stone Valley Rd (Alamo). Off Ramp blocked. Expect delays. Aug 9, 2:30 AM

Source: 511_sfbay · ID 511.org/1533041 First seen Aug 9, 2026 2:30 AM