Accident Moderate Severity Resolved

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Cummings Skwy (Port Costa). Right lane blocked. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 21, 2026 at 6:04 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 21, 11:04 AM

Last Updated

2 months ago

Aug 21, 11:45 AM

Resolved

Aug 21, 6:00 PM

Coordinates

38.0163, -122.1862

Update History

2 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Cummings Skwy (Port Costa). Right lane blocked. Expect delays. Aug 21, 11:30 AM

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Cummings Skwy (Port Costa). Left lane blocked. Expect delays. Aug 21, 11:15 AM

Source: 511_sfbay · ID 511.org/1538851 First seen Aug 21, 2026 11:15 AM