Update #9: Overnight Lane, Ramp and Full Highway Closures on State Route 4 in Contra Costa County

Scheduled: Nightly, Sunday-Thursday between the hours of 7:00 p.m. to 8:00 a.m.

Contra Costa County - For the safety of the motoring public and our crews, Caltrans Construction has adjusted its schedule to allow crews to continue various operations along State Route 4 (SR-4). Overnight full closures, including lane and ramp closures, on westbound and eastbound SR-4 between SR-160 and Byron Highway will continue tonight and Sunday through Thursday nights, between the hours of 7:00 p.m. and 8:00 a.m., as construction progresses. Motorists are advised to plan ahead, allow additional travel time, prepare to merge, and slow for the cone zone. All work is weather dependent and subject to change. For current Caltrans District 4 lane closure information click here.

Full Closure SR-4 - Balfour Road to Byron Highway through 7:00 p.m. to 5:00 a.m.

• Full closures of the conventional highway sections of SR-4 between Balfour Road and Byron Highway through Marsh Creek Road - for paving operations
• Full Closures will continue through August 2026 throughout this corridor

Eastbound SR-4 - Hillcrest Avenue to SR-160 8:00 p.m. to 8:00 a.m.

• Alternating closures of lanes #3 and #4
• Hillcrest Avenue on-ramp to eastbound SR-4 - CLOSED for drainage improvements

Westbound SR-4 Ramp Closures 7:00 p.m. to 5:00 a.m.

• Sand Creek Road on-ramp to westbound SR-4 - CLOSED for guardrail work
• Balfour Road on-ramp to westbound SR-4 - CLOSED for guardrail work
• Balfour Road off-ramp from westbound SR-4 - CLOSED for electrical work

Eastbound SR-4 Balfour Road Off-Ramp 8:00 p.m. to 8:00 a.m.

• Balfour Road off-ramp from eastbound SR-4 - CLOSED for electrical work

Please note complete closures, as well as lane and ramp closures, will continue along SR-4 Sunday through Thursday nights as construction progresses. The westbound SR-4 closures are expected to reopen by 5:00 a.m., while the eastbound SR-4 to closures are expected to reopen by 8:00 a.m.

State Route 4 Detour Information for Full Closure

• Eastbound SR-4 from Antioch, Pittsburg, and Martinez towards Discovery and Stockton: The detour begins at Balfour Road. Take the Balfour Road exit, turn left on Balfour Road, turn right onto Brentwood Boulevard or continue Balfour Road, then turn right into Byron, follow SR-4.
• Westbound SR-4 from Discovery Bay and Stockton towards Martinez / Antioch/Oakland: The detour begins at the Byron, turn left onto Brentwood Boulevard, turn left into Balfour Road or continue Byron Highway, turn left into Balfour Road, continue Balfour Road, turn right onto the westbound SR-4 on-ramp, and continue on SR-4.
• Westbound Vasco Road towards Martinez/Antioch/Oakland: The detour begins at Walnut Boulevard. Turn right on to Walnut Boulevard, turn left onto Balfour Road, continue Balfour Road, turn right onto the west-bound SR-4 on-ramp, and continue to SR-4.
• Eastbound from Martinez/ Antioch Oakland to Livermore: The detour begins at Balfour exit. Left on Balfour Road, continue Balfour Road, take left turn into Walnut Boulevard, turn left Vasco Road, continue Vasco Road.

This paving project is tentatively scheduled to be completed by Summer 2027.

Drivers may experience minor delays and are advised to plan ahead and allow extra time. For 24/7 traffic updates, follow 511.org on Twitter. For real-time traffic, visit Caltrans QuickMap at Quickmap.dot.ca.gov. To view more D4 Projects, visit: Caltrans D4 Traffic Advisory Publications.

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

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