CONTRA COSTA COUNTY, CA (Oct. 26, 2021) — A Caltrans and Contra Costa Transportation Authority project this week will impact State Route 4 and connector ramps to I-680, spanning Martinez, Pacheco, and Concord.
This week’s phase of the multi-phased project will improve safety and help reduce congestion at the I-680/SR-4 Interchange in central Contra Costa County. The agencies plan the closures to facilitate construction work on SR-4 over Grayson Creek. They have scheduled the closures during evening hours in order to minimize impacts to the motoring public.
The work includes installing overhead signs along Highway 4, which will span each direction of the highway. This current phase of construction nears completion this week.
Planned closures include
Tuesday, October 26 beginning at Midnight until 4am on Wednesday October 27, 2021.
- Eastbound State Route 4 between Pacheco Boulevard and I-680, full freeway closure.
- Pacheco Boulevard on-ramp to Eastbound State Route 4, full ramp closure.
- Eastbound State Route 4 connector to Southbound I-680, full ramp closure.
Wednesday, October 27 beginning at 11pm until 4am on Thursday, October 28, 2021.
- Westbound State Route 4 between Peralta Road and I-680, full freeway closure.
- Solano Way on-ramp to Westbound State Route 4, full ramp closure.
- Westbound State Route 4 connector to Northbound I-680, full ramp closure.
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. 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.
Goals of the 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. Adding a third lane in the eastbound and westbound directions will improve on-ramp and off-ramp merging.
Project plans also include widening of five structures. They will extend eastbound State Route 4’s carpool lane approximately two miles, and install safety lighting. Also, they plan to replace 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.