Accident Moderate Severity Resolved

CHP : Disabled vehicle on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on July 6, 2026 at 5:31 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jul 5, 10:31 PM

Last Updated

3 months, 3 weeks ago

Jul 5, 11:00 PM

Resolved

Jul 6, 5:00 AM

Coordinates

37.8900, -121.5484

Update History

1 observations

CHP : Disabled vehicle on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 5, 10:45 PM

Source: 511_sfbay · ID 511.org/1517160 First seen Jul 5, 2026 10:45 PM