Accident High Severity Resolved

CHP : Traffic Collision on CA-4 Westbound south of Somersville Rd (Antioch). Off Ramp affected. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on July 8, 2026 at 7:34 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jul 8, 12:34 AM

Last Updated

3 weeks, 1 day ago

Jul 8, 12:45 AM

Resolved

Jul 8, 7:00 AM

Coordinates

38.0035, -121.8355

Update History

2 observations

CHP : Traffic Collision on CA-4 Westbound south of Somersville Rd (Antioch). Off Ramp affected. Expect delays. Jul 8, 12:45 AM

CHP : Traffic Collision on CA-4 Eastbound south of Somersville Rd (Antioch). Off Ramp affected. Expect delays. Jul 8, 12:15 AM

Source: 511_sfbay · ID 511.org/1518088 First seen Jul 8, 2026 12:15 AM