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  5. Daytime Weekend Lane and Ramp Closures on Wb State Route 4 In Bay Point Between San Marco Boulevard and Kinne Boulevard.

Daytime Weekend Lane and Ramp Closures on Wb State Route 4 In Bay Point Between San Marco Boulevard and Kinne Boulevard.

Published:

Saturday, July 11,2026, 5:30 a.m. to 1:30 p.m.

Contra Costa County — Caltrans maintenance will conduct lane closures on westbound SR-4, from Bay Point/San Marco Boulevard through Kinne Boulevard, specifically affecting lanes 3 and 4 (two right lanes) and the “West” Willow Pass Road on-ramp to westbound SR-4 from will be closed. These closures are necessary to repair a bridge deck spall in lane 3.

Map of where daytime weekend lane and ramp closures on Wb State Route 4 in Bay Point between San Marco Boulevard and Kinne Boulevard.

Please prepare to merge early and slow for the cone zone.

Eastbound SR-4 traffic is not expected to be affected. Motorists are advised to expect delays and allow extra time.

For more information about D4 Projects, visit: Caltrans D4 Current Projects

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.