CONTRA COSTA COUNTY — For the safety of the motoring public and our crews Caltrans Construction has scheduled full closures for ongoing paving operations on State Route 4 (SR-4), spanning from Hillcrest Avenue to Byron Highway to apply the final layer of Rubberized Hot Mix Asphalt (RHMA).
Full closures of SR-4 in both east and westbound directions will now take place beginning, Sunday June 21, 2026, between Lonetree Way, and Walnut Boulevard from 8:00 p.m. until 8:00 a.m., Monday, June 22, 2026,
- Full Closure SR-4 Lonetree Way to Balfour Road, June 21, 2026, 8 p.m. to Midnight
- Full Closure SR-4 Lonetree Way to Walnut Boulevard, June 22, 2026, Midnight to 8 a.m.
- Westbound SR-4 will reopen at 5:00 a.m.
Please note: All scheduled work is weather dependent and subject to change.
WHAT TO EXPECT
Drivers should note that Lane and ramp closure will continue to take place on SR-4 every Sunday through Thursday night between the hours of 7:00 PM to 8:00 AM . To search for current District 4 lane closure information, please click here. This project is tentatively scheduled to be complete by Summer 2027.
Changeable message signs (CMS) will be posted throughout the corridor to assist drivers. For 24/7 traffic updates, follow 511.org on Twitter. For real-time traffic, visit Caltrans QuickMap.
All work is dependent on weather.
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