Accident Moderate Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound east of Willow Pass Rd (Concord). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on September 17, 2026 at 5:20 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 16, 10:20 PM

Last Updated

1 month, 1 week ago

Sep 16, 10:30 PM

Resolved

Sep 17, 4:30 AM

Coordinates

38.0174, -121.9904

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of Willow Pass Rd (Concord). Lane affected. Expect delays. Sep 16, 10:30 PM

Source: 511_sfbay · ID 511.org/1550631 First seen Sep 16, 2026 10:30 PM