Full Closure for Eastbound State Route 4 (SR-4) between San Pablo Avenue and Cummings Skyway in Contra Costa County

Monday, December 8, 2025, through Wednesday, December 17, 2025, 7 PM to 6 AM, each night 

Contra Costa County — Caltrans will implement a full closure of eastbound SR-4 between San Pablo Avenue and Cummings Skyway, beginning Monday, December 8, 2025, through Wednesday December 17, 2025 nightly from 7:00 PM to 6:00 AM. Please note this schedule is tentative and subject to change depending on weather conditions and construction progress.

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

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

*Reverse one-way traffic control and temporary traffic signal near I-80 at Cummings Skyway Overcrossing.*

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. I-80 to Cummings Skyway Exit;
5. Exit on Cummings Skyway Rd.;
6. Right on Cummings Skyway Rd.;
7. Right on EB Hwy 4 Onramp

Please follow posted signs and detour routes during the closure periods. Westbound SR-4 traffic is not expected to be affected. Motorists are advised to expect delays and allow extra time. For 24/7 traffic updates, follow 511.org on Twitter. For real-time traffic, visit Caltrans QuickMap. 

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