Accident Moderate Severity Resolved

CHP : Traffic Collision on CA-4 Eastbound south of Somersville Rd (Antioch). Right shoulder blocked. Expect delays.

A injury accident was reported on CA-4 E near Contra Costa on October 21, 2026 at 11:29 PM.

Road

CA-4 E

Area

Contra Costa

Address

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Started

Oct 21, 4:29 PM

Last Updated

6 days ago

Oct 21, 4:30 PM

Resolved

Oct 21, 10:45 PM

Coordinates

38.0024, -121.8327

Update History

1 observations

CHP : Traffic Collision on CA-4 Eastbound south of Somersville Rd (Antioch). Right shoulder blocked. Expect delays. Oct 21, 4:30 PM

Source: 511_sfbay · ID 511.org/1566823 First seen Oct 21, 2026 4:30 PM