Accident Moderate Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound west of Somersville Rd (Antioch). Right lane blocked. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on July 16, 2026 at 1:46 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jul 15, 6:46 PM

Last Updated

2 weeks ago

Jul 15, 7:15 PM

Resolved

Jul 16, 1:15 AM

Coordinates

38.0041, -121.8376

Update History

2 observations

CHP : Traffic Hazard on CA-4 Westbound west of Somersville Rd (Antioch). Right lane blocked. Expect delays. Jul 15, 7:00 PM

CHP : Traffic Hazard on CA-4 Westbound west of Somersville Rd (Antioch). Lanes affected. Expect delays. Jul 15, 6:30 PM

Source: 511_sfbay · ID 511.org/1521632 First seen Jul 15, 2026 6:30 PM