Accident Moderate Severity Resolved

CHP : Traffic Hazard 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 25, 2026 at 9:10 PM.

Road

CA-4 W

Area

Contra Costa

Address

Loading…

Started

Jul 25, 2:10 PM

Last Updated

2 days, 8 hours ago

Jul 25, 2:30 PM

Resolved

Jul 25, 8:45 PM

Coordinates

37.8914, -121.5702

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 25, 2:15 PM

Source: 511_sfbay · ID 511.org/1526235 First seen Jul 25, 2026 2:15 PM