Traffic Advisory: State Route 4 Westbound Lane Shift at Somersville Road Starting Sunday, August 19

The California Department of Transportation (Caltrans) and the Contra Costa Transportation Authority (CCTA) are widening State Route 4 (SR-4) through Pittsburg and Antioch. Construction has reached a milestone with the completion of the westbound Somersville Road Bridge.

Traffic flow on SR-4 at Somersville Road will be modified over several nights during the week of August 19, 2012, and westbound traffic will shift to the newly completed bridge. During this time frame, all westbound lanes and several ramps in the vicinity will periodically be closed to traffic overnight to accommodate the work.

Once all the traffic modifications on SR-4 at Somersville Road are completed, construction will begin on the new eastbound permanent pavement in this vicinity. Eastbound traffic will be temporarily shifted to the new westbound bridge. There will then be two eastbound and two westbound lanes on the new structure. While this traffic detour is in place, the old/inactive eastbound bridge will then be demolished and construction will begin on a new eastbound bridge and an eBART bridge.

The SR-4 Widening Project includes over $570 million in State, Federal, and Contra Costa Measure J sales tax, and other local funds to widen SR-4 from four to eight lanes between Loveridge Road and SR-160. The combined effort of Caltrans and the Contra Costa Transportation Authority on projects in the SR4 corridor will reduce congestion, create a safer roadway, improve operations, and reduce traffic delays on this important east-west connector.

When completed, the SR-4 highway median will be used to extend BART service from Pittsburg/Bay Point to a new station at Hillcrest Avenue in Antioch.

The project web site at: will have updated lane closure information. Caltrans and CCTA appreciate your patience as we work to improve the highways

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