West County: Eastbound Hwy 4, Richmond-San Rafael Bridge closures Oct. 7-10 & 13

By Denise Harding, PIO & Nathaniel Fowler, Health & Safety Specialist, Caltrans

Caltrans will implement a full closure of eastbound State Route 4 (SR-4) between San Pablo Avenue in Hercules in Western Contra Costa County and Cummings Skyway, beginning Tuesday, October 7 through Friday, October 10, nightly and on Monday, October 13, 2025, nightly from 7:00 PM to 5:00 AM. On-ramps along eastbound SR-4 during this time, will be closed include San Pablo Avenue, Willow Avenue and Franklin Canyon Road. The closures are necessary to allow paving crews to complete work in the Cummings Skyway area. Westbound SR-4 traffic is not expected to be affected.

Detour Plan for EB SR-4 Traffic from I-80 to Cummings Skyway

1. Continue EB 80 to Cummings Skyway Exit
2. Exit on Cummings Skyway road;
3. Right on Cummings Skyway road;
4. Right on EB Hwy 4 Onramp

Detour Plan for EB SR-4 Traffic from Willow Avenue to Cummings Skyway

1. Continue West on Willow Ave.;
2. Right on Sycamore Ave.;
3. Right on San Pablo Ave.;
4. 80 to Cummings Skyway Exit;
5. Exit on Cummings Skyway road;
6. Right on Cummings Skyway road;
7. Right on EB Hwy 4 Onramp

Richmond–San Rafael Bridge (I-580) Nighttime Lane Closures – Oct 7–10, 9PM–5AM (EB) & Oct 9–10, 8PM–5AM (WB) Maintenance work between Toll Plaza & Marin end.

Caltrans will be closing lanes on the Richmond-San Rafael Bridge (I-580), nightly starting Tuesday, October 7th through Friday, October 10th westbound 8:00 PM until 5:00 AM and eastbound 9:00 PM until 5:00 AM, the following morning due to maintenance. The lane closures will begin from the Toll Plaza to the west end of the bridge in Marin County. One lane will remain OPEN at all times. Expect delays & drive safely.  Detours in place – expect delays.

Closure Details:

• Eastbound – Left Shoulder and Lane #2 will be closed Tuesday, Oct. 7th-10th, 9 PM to 5 AM.
• Westbound – Lane #2 will be Closed Thursday, Oct. 9th & 10th, 8PM to 5AM

Traffic Control Measures:

Changeable Message Signs (CMS) will alert drivers of closure. Motorists should expect minor delays, reduce speed and plan extra travel time.

Please note this information is tentative and subject to change depending on weather conditions and construction progress. Please follow posted signs and detour routes during the closure periods. Motorists are advised to expect delays and allow extra time. For 24/7 traffic updates, follow 511.org on Twitter/X. For real-time traffic, visit Caltrans QuickMap.