Accident Moderate Severity Resolved

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

A injury accident was reported on CA-4 W near Contra Costa on August 11, 2026 at 12:48 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 11, 5:48 AM

Last Updated

1 day, 3 hours ago

Aug 11, 6:00 AM

Resolved

Aug 11, 12:00 PM

Coordinates

38.0035, -121.8355

Update History

2 observations

CHP : Traffic Collision on CA-4 Westbound west of Somersville Rd (Antioch). Right lanes blocked. Expect delays. Aug 11, 6:00 AM

CHP : Traffic Collision on CA-4 Westbound west of Somersville Rd (Antioch). Lane affected. Expect delays. Aug 11, 5:45 AM

Source: 511_sfbay · ID 511.org/1533846 First seen Aug 11, 2026 5:45 AM