Update #6: Overnight Full Closures are Scheduled on State Route 4 Between Lone Tree Way and Walnut Boulevard in Brentwood, Monday, July 6, 2026.

Nightly Full closures continue between the hours of 8:00 p.m. to 8:00 a.m.

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 be implemented Tonight, 8:00 p.m. Monday, July 6, 2026, in the City of Brentwood between Lone Tree Way, to Walnut Boulevard until 8:00 a.m., Tuesday, July 7, 2026.

Full Closure Details for, Monday July 6, 2026, 8 p.m. to 8 a.m.

• Eastbound SR-4 between Lone Tree Way and Walnut Boulevard
• Westbound SR-4 between Walnut Boulevard and Balfour Road
• 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.

Detour Information

Eastbound:

To Livermore:

• Exit EB Highway 4 to Lone Tree Way
• Turn Right on Lone Tree Way
• Turn left on Hillcrest Road
• Turn left on Sand Creek Road
• Turn right on Fairview Avenue
• Turn Left on Balfour Road
• Right on Walnut Boulevard
• Turn left on Vasco Road

To Byron and Discovery Bay:

• Exit EB Highway 4 to Lone Tree Way
• Turn right on Lone Tree Way
• Turn left on Sand Creek Road
• Turn right on Fairview Avenue
• Turn left on Balfour Road
• Right on Walnut Boulevard
• Run left on March Creek Road

Westbound:

From Vasco Road:

• Make a right on Walnut Boulevard
• Turn left on Balfour Road
• Take the WB Highway 4 onramp

From Byron and Discovery Bay:

• Turn right on Walnut Boulevard
• Turn left on Balfour Road
• Take the WB Highway 4 onramp

Please follow posted signs and detour routes during these closure periods. Motorists are advised to expect delays and allow extra travel time.

Caltrans thanks the public for their patience and cooperation during these necessary closures and improvements. Your understanding helps keep our crews and roadways safe for everyone.

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