Martinez, CA: The California Department of Transportation (Caltrans) and the Contra Costa Transportation Authority (CCTA) 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 connector ramps to I-680, 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 the installation of overhead signs along Highway 4, which will span each direction of the highway. This work is being performed as the current phase of construction nears completion – laying the foundation for future improvements at the heavily-used interchange.
Planned closures include:
Eastbound State Route 4: Tuesday, October 26 beginning at Midnight until 4am on Wednesday October 27, 2021
• Full freeway closure of Eastbound State Route 4 between Pacheco Boulevard and I-680.
• Full ramp closure of Pacheco Boulevard on-ramp to Eastbound State Route 4.
• Full ramp closure of Eastbound State Route 4 connector to Southbound I-680
Wednesday, October 27 beginning at 11pm until 4am on Thursday, October 28, 2021
• Full freeway closure of Westbound State Route 4 between Peralta Road and I-680
• Full ramp closure of Solano Way on-ramp to Westbound State Route 4.
• Full ramp closure of Westbound State Route 4 connector to Northbound I-680.
Motorists are advised to be 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 vehicle ahead of you. Please note that the construction schedule and closure information presented here are 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 Interstate 680/State Route 4 Interchange Improvement Project
The Interstate 680/State Route 4 Interchange Improvement Project will widen approximately four miles of State Route 4 in both directions between Morello Avenue in Martinez and State Route 242 by adding a third lane in the eastbound and westbound directions to improve on-ramp and off-ramp merging. The project also includes widening of five structures, extending eastbound State Route 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.