Overnight Full Closures on State Route 4 Scheduled Between Lonetree Way and Walnut Boulevard in Contra Costa County Delayed Until Sunday, June 21, 2026

Nightly Full closures continue tonight between the hours of 8:00 PM to 8:00 AM

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.

DETOUR INFORMATION

EASTBOUND:

To Livermore:

• Exit EB Hwy 4 to Lone Tree Way
• Turn right on Lone Tree Way
• Turn left on Hillcrest Rd
• Turn left on Sand Creek Rd
• Turn right on Fairview Ave
• Turn left on Balfour Road
• Right on Walnut Blvd
• Turn left on Vasco Rd

To Byron and Discovery Bay:

• Exit EB Hwy 4 to Lone Tree Way
• Turn right on Lone Tree Way
• Turn left on Sand Creek Rd
• Turn Right on Fairview Ave
• Turn left om Balfour Road
• Right on Walnut Blvd
• Turn left on Marsh Creek Road

WESTBOUND:

From Vasco Rd:

• Make a right on Walnut Blvd
• Turn left on Balfour Rd
• Take the WB Hwy 4 onramp

From Byron and Discovery Bay:

• Turn right on Walnut Blvd
• Turn left on Balfour Rd
• Take the WB Hwy 4 onramp

All work is weather dependent and is subject to change.

Byron and Discovery Bay - Livermore

Please follow posted signs and detour routes during these closure periods. Motorists are advised to expect delays and allow extra travel time. Please see next page for more detour information.

DETOUR INFORMATION

EASTBOUND:

To SR-4:

• Exit EB Hwy 4 to Lone Tree Way
• Turn right on Lone Tree Way
• Turn left on Hillcrest Rd
• Turn left on Sand Creek Rd
• Turn right on Fairview Ave
• Turn righton Balfour Road
• Right onto EB SR-4 onramp

All work is weather dependent and is subject to change.

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.