Nightly Full closures continue between the hours of 7:00 p.m. to 5:00 a.m.
Contra Costa County —For the safety of the motoring public and our crews, Caltrans Construction will continue full closures on SR-4; spanning from Hillcrest Avenue to Byron Highway for ongoing paving and drainage operations. Full closures of eastbound and westbound SR-4 will be implemented, nightly from 7:00 p.m. to 5:00 a.m. in the City of Brentwood between Balfour Road and Byron Highway. Please note as work progresses the full closure may shorten, please follow posted detour signs and slow for the cone zone. To search for current District 4 lane closure information, please click here.
Full Closure Details Nov. 2, 2026-Thursday Nov. 5 bet 7 p.m. to 5 a.m.
Eastbound and Westbound SR-4 – Balfour Road to Marsh Creek Road
- Closure: Full closure of both lanes
- Work: Roadway striping operations
Eastbound and Westbound SR-4 – Marsh Creek Road to Byron Highway
- Closure: Full closure of both lanes
- Work: Roadway striping operations
Please note: All scheduled work is weather dependent and subject to change.
WHAT TO EXPECT
Motorists are advised that complete closures, as well as lane and ramp closures, will continue along SR-4 Sunday through Thursday nights between 8:00 p.m. and 8:00 a.m. The westbound closures on SR-4 will reopen at 5:00 a.m. 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 X. For real-time traffic, visit Caltrans QuickMap.
DETOUR INFORMATION
EASTBOUND:
To Livermore:
- Exit EB Hwy 4 on Balfour Rd
- Right on Walnut Blvd
- Left turn on Vasco Rd.
To Byron and Discovery Bay:
- Exit EB Hwy 4 on Balfour Rd
- Turn Left on Balfour Rd
- Turn right on Walnut Blvd
- Turn right 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.
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.
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.
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