Daytime Full Closures of Stone Valley Road On-Ramp to Southbound I-680 In Alamo

Monday-Friday 10AM to 6PM through August 2026

Contra Costa County - Caltrans will continue full closures of the Stone Valley Road on-ramp to southbound Interstate 680 (I-680) in Alamo Monday through August 2026, from 10:00 AM to 6:00 PM, each day. All work is weather dependent and subject to change. These closures are necessary to support ongoing fiber optic installation, ramp metering system improvements, and widening of the Stone Valley Road on-ramp. Work includes reconstruction of the retaining wall and sound wall as part of continued infrastructure improvements along the I-680 corridor in Contra Costa County.

Ramp Closure Information
Stone Valley Road on-ramp to southbound I-680
Date: Monday - Friday through August 2026
Time: 10:00 AM to 6:00 PM

Detour Information
During the temporary closure of Stone Valley Road on-ramp:

• Left or Right Turn from Stone Valley Road to NB Danville Road
• Right Turn to EB Livorna
• Enter SB 680 On-Ramp

This project is scheduled to continue through Winter 2028 weather permitting.

**All work is weather dependent and subject to change**

Be work zone alert, drive with caution through the work zone. Caltrans appreciates the public's patience during this essential safety work. For real-time traffic conditions, closures, and detours, visit Caltrans QuickMap or follow 511.org for 24/7 traffic updates.

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.