A traffic collision was reported at about 3:51 p.m. Oct. 2, 2026, on the northbound Interstate 680 off-ramp to Stone Valley Road. The incident was handled through the California Highway Patrol’s Contra Costa area.
The location was identified as the northbound I-680 connector at the Stone Valley Road east off-ramp. CHP classified the collision as one involving no reported injuries.
The dispatch information did not provide descriptions of the vehicles involved or indicate that lanes on the main freeway were blocked. It also did not document an ambulance, fire response or tow request.
A subsequent dispatch note stated that the reporting party may have been traveling in an unmarked vehicle. No additional details about the collision were provided in the CHP information.
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