Caltrans Bay Area-District 4

Caltrans crews will be performing overnight maintenance (spalling repairs) on the Richmond–San Rafael Bridge (I-580), which will require a lane closure:

🗓 Saturday, May 30, 2026
🕘 9:00 PM – 7:00 AM (Sunday morning)

🔹 Closure Details:
• Westbound I-580 Lane #2 (upper deck) will be CLOSED across the bridge
• Lane #1 will remain OPEN
• 🚲 Bike path remains accessible

⚠️ What to Expect:
• Minor delays
• Merging traffic
• Reduced speeds through the work zone

Please plan ahead, allow extra travel time, and slow for the cone zone to help keep crews and drivers safe.

🔎 To search current District 4 lane closures:
https://lcswebreports.dot.ca.gov/searchdistricts?district=4

Thank you for your patience as we work to maintain and improve our roadway infrastructure.

🚨UPDATE: Stenmark Drive On-Ramp Closure Delayed in Contra Costa County — The full closure of the Stenmark Drive on-ramp to westbound I-580 near the Richmond–San Rafael Bridge has been delayed by one week due to coordination needs.
🗓 NEW SCHEDULE:
• Begins: 7:00 PM, Monday, June 8, 2026
• Ends: 5:30 AM, Friday, July 10, 2026
🚫 Closure Details:
All vehicles must use a detour to access westbound I-580 during this period.
🔁 Detour Route:
• Travel east on Stenmark Dr
• Take EB I-580 on-ramp
• Exit at Canal Blvd
• Head north on Canal Blvd
• Re-enter WB I-580
⚠️ What to Expect:
• Delays and merging traffic
• Reduced speeds through the work zone
• Construction activity near travel lanes
This work supports the Richmond–San Rafael Bridge Open Road Tolling Project and is critical for improving safety and traffic flow.
🔎 For current lane closures:
https://lcswebreports.dot.ca.gov/searchdistricts?district=4
Please plan ahead and slow for the cone zone to help keep crews and drivers safe.

🚧 TRAFFIC ADVISORY: Overnight closure scheduled for the southbound I-680 to eastbound I-580 connector in Alameda County for emergency joint repairs.

📅 Sunday, June 7
🕘 9:00 PM – 5:00 AM

Detour:
• Exit at Stoneridge Drive from SB I-680
• Head east on Stoneridge Drive
• Re-enter I-680 North and follow signs to EB I-580

⚠️ Drivers should expect delays, follow posted detours, and use extra caution in the work zone.

Stay updated on highway conditions with QuickMap and Caltrans social media channels.

🚧 Contra Costa County -- Overnight full closures on SR-4 between Balfour Road and Marsh Creek Road have been extended due to recent rain delays impacting paving operations.

📅 Nightly closures now scheduled:
🗓 May 31 – June 1, 2026
🕢 7:30 PM – 5:00 AM

Drivers should expect overnight detours, delays, and limited access during closure periods. Access will remain available for local residents, businesses, and employees.

⚠️ Beginning June 1, overnight full closures on Marsh Creek Road (SR-4) are expected to resume Sunday through Thursday nights from 7:30 PM to 5:00 AM.

🚗 Please follow posted detour signs, allow extra travel time, and plan ahead. All work remains weather dependent and schedules may change.

Traffic Alert: I-580 (Richmond–San Rafael Bridge)
Stenmark Dr on-ramp to WB I-580 CLOSED

🗓 Starts Mon 6/1 at 7 PM
⏳ Through 7/1 (tentative)

Detour: EB I-580 → Canal Blvd → WB I-580

Closure supports toll plaza construction. Expect delays—plan ahead, slow down, and follow posted detours.

Great news for Contra Costa families: Youth Ride Free is back this summer!

No application. No ID. No special pass. Just hop on and go!

This countywide program was made possible in part because of contributions from Contra Costa County Supervisors Diane Burgis and Shanelle Scales-Preston to ensure every student or child in the county has access to free transit this summer.

Yes, that means everyone 18 and under can ride County Connection (Central Contra Costa Transit Authority) Tri Delta Transit, and WestCAT buses for free from June 1 through July 31.

Why are we doing this? Because Youth Ride Free gives students more independence and gives parents one less ride to coordinate.

Whether it is getting to a summer job, the library, parks, activities, shopping, or time with friends, this program helps young people stay connected across Contra Costa County.

The program is also supported by CCTA through Measure J, as well as state funding sources (LCTOP) for WestCat.

Learn more: YouthRideFree.com

Thank you to everyone who joined us at the second community workshop for the SR 29 – American Canyon Corridor Improvement Project! 🚧

Yesterday, community members gathered at American Canyon City Hall to learn more about proposed improvements along the SR 29 corridor, ask questions, and share valuable feedback that will help shape the future of this important roadway.

This collaborative effort between NVTA, the City of American Canyon, and Caltrans continues to build on community input to improve safety, mobility, and connectivity for all who travel through the corridor.

We appreciate everyone who took the time to participate and help move this project forward.

More information: https://nvta.ca.gov/projects/sr-29-american-canyon-improvements/

For the safety of the traveling public, Caltrans crews cleared an encampment site along I-80 at McLaughlin St in Richmond, Contra Costa County.

Crews removed approximately 30 cubic yards of debris. Two individuals were offered services.

🚧 Emergency Road Closure – San Pablo Ave (SR-123)

Heads up Alameda County drivers!

All lanes are CLOSED in both directions on San Pablo Avenue (SR-123) between Adeline Street and Peralta Street due to emergency gas line repair work.

🕒 Closure in effect until midnight tonight

⚠️ What to Expect:
• Traffic detours in the area
• Potential delays
• Increased activity from emergency crews

Please avoid the area if possible, follow posted detours, and drive with caution to keep crews safe.