Accident High Severity Resolved

CHP : Traffic Collision on CA-4 Westbound entering at Somersville Rd (Antioch). On Ramp blocked. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on October 25, 2026 at 7:31 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Oct 25, 12:31 PM

Last Updated

1 day, 15 hours ago

Oct 25, 12:45 PM

Resolved

Oct 25, 6:45 PM

Coordinates

38.0052, -121.8419

Update History

2 observations

CHP : Traffic Collision on CA-4 Westbound entering at Somersville Rd (Antioch). On Ramp blocked. Expect delays. Oct 25, 12:45 PM

CHP : Traffic Collision on CA-4 Westbound at Somersville Rd (Antioch). On Ramp blocked. Expect delays. Oct 25, 12:30 PM

Source: 511_sfbay · ID 511.org/1568398 First seen Oct 25, 2026 12:30 PM