Accident Moderate Severity Resolved

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 4, 2026 at 1:09 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 4, 6:09 AM

Last Updated

9 hours, 33 minutes ago

Aug 4, 6:15 AM

Resolved

Aug 4, 12:30 PM

Coordinates

37.8903, -121.5694

Update History

1 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Aug 4, 6:15 AM

Source: 511_sfbay · ID 511.org/1530610 First seen Aug 4, 2026 6:15 AM