Nightly Freeway Closures Planned for SR-4 and I-680 Connector Ramps
Saturday August 21 through Sunday, August 30, 2020
Wednesday, August 18, 2020
Contact Information
Linsey Willis
Contra Costa Transportation Authority
925-256-4728
lwillis@ccta.net
Marcus Wagner
California Department of Transportation
510-867-6840
marcus.wagner@dot.ca.gov
The Contra Costa Transportation Authority (CCTA) and the California Department of Transportation (Caltrans) are constructing one phase of a multi-phased project to improve safety and help reduce congestion at the I-680/SR-4 Interchange in central Contra Costa County. The agencies are planning closures to facilitate construction work on SR-4 over Grayson Creek. These closures will impact SR-4 and both of the I-680 connector ramps, spanning Martinez, Pacheco, and Concord. CCTA and Caltrans have scheduled the closures during evening hours in order to minimize impacts to the motoring public.
Work during the closures will include:
- Transporting and setting 24 girders spanning Grayson Creek for bridge construction
Nightly Freeway Closures of SR-4 and I-680 Connector Ramps
In order to ensure crew and public safety during planned construction work, temporary nighttime freeway closures in both directions of the SR-4 and I-680 connector ramps will occur for a total of six nights. 
Friday August 21, Tuesday August 25, and Thursday August 27th: Closures from 11:00 p.m.to 4:00 a.m.
- Nightly Lane closures on Eastbound and Westbound SR-4 from Pacheco to Solano Way
- Nightly closures of the I-680/SR-4 connector ramps
EASTBOUND SR-4 CLOSURES BETWEEN I-680 AND SOLANO WAY
Saturday, August 22 through Monday, August 24: Closures between 11:00 p.m. and 8:00 a.m.
- Full Freeway Closure of Eastbound SR-4 between Pacheco Boulevard and Solano Way
- Full Ramp Closure of Eastbound SR-4 connector to Northbound I-680
- Full Ramp Closure of Southbound I-680 connector to Eastbound SR-4
- Full Ramp Closure of Northbound I-680 connector to Eastbound SR-4
WESTBOUND SR-4 CLOSURES BETWEEN SOLANO WAY AND I-680 
Wednesday, August 26: Closures between 9:00 p.m. and 6:00 a.m.
- Full Freeway Closure of Westbound SR-4 between Solano Way and Pacheco Boulevard
- Full Ramp Closure of Northbound I-680 connector to Westbound SR-4
- Full Ramp Closure of Westbound SR-4 connector to Southbound I-680
- Full Ramp Closure of Westbound SR-4 connector to Northbound I-680
Friday, August 28 and Saturday, August 29: Closures between 10:00 p.m. and 8:00 a.m.
- Full Freeway Closure of Westbound SR-4 between Solano Way and Pacheco Boulevard
- Full Ramp Closure of Northbound I-680 connector to Westbound SR-4
- Full Ramp Closure of Westbound SR-4 connector to Southbound I-680
- Full Ramp Closure of Westbound SR-4 connector to Northbound I-680
Motorists are advised to be on alert for on-site closure and detour signs and to “Slow for the Cone Zone.” Please drive with caution through the detours and leave a safe traveling distance between your vehicle and the vehicle ahead of you. Please note that the construction schedule and closure information presented here is subject to change based on weather and other conditions. We appreciate everyone’s patience and cooperation as we work to complete these important improvements.
About the I-680/SR-4 Interchange Improvement Project
The I-680/SR-4 Interchange Improvement Project will widen approximately four miles of SR-4 in both directions between Morello Avenue in Martinez and State Route 242 by adding an additional lane in the EB and WB directions to improve on-ramp and off-ramp merging. The project also includes widening of five structures, extending EB SR-4’s carpool lane approximately two miles, installation of safety lighting, and replacement of the Grayson Creek Bridge to bring it up to current State bridge safety codes. This segment of work in this multi-phased project will lay the groundwork for future improvements to connector ramps, improve traffic safety and enhance traffic flow.
For more information:
www.ccta.net/2018/10/17/interstate-680-state-route-4-interchange-improvements/