Accident Moderate Severity Resolved

CHP : Traffic Collision with Injuries on CA-4 Westbound west of Byron Hwy (Brentwood). Left lane blocked. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on September 9, 2026 at 7:10 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 9, 12:10 PM

Last Updated

1 month, 2 weeks ago

Sep 9, 12:30 PM

Resolved

Sep 9, 6:45 PM

Coordinates

37.8965, -121.6413

Update History

1 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound west of Byron Hwy (Brentwood). Left lane blocked. Expect delays. Sep 9, 12:15 PM

Source: 511_sfbay · ID 511.org/1546918 First seen Sep 9, 2026 12:15 PM