Accident High Severity Resolved

CHP : Traffic Collision on CA-4 Eastbound at Lone Tree Way Bypass (Antioch). Right shoulder affected. Expect delays.

A high-severity accident was reported on CA-4 E near Contra Costa on June 21, 2026 at 4:51 AM.

Road

CA-4 E

Area

Contra Costa

Address

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Started

Jun 20, 9:51 PM

Last Updated

1 month, 1 week ago

Jun 20, 10:15 PM

Resolved

Jun 21, 4:30 AM

Coordinates

37.9648, -121.7406

Update History

1 observations

CHP : Traffic Collision on CA-4 Eastbound at Lone Tree Way Bypass (Antioch). Right shoulder affected. Expect delays. Jun 20, 10:15 PM

Source: 511_sfbay · ID 511.org/1511131 First seen Jun 20, 2026 10:15 PM