Somersville Road/Auto Center Drive closure for Highway 4 construction

As part of the Highway 4 (SR-4) widening construction work, the contractor will start preparing for the full removal of the temporary supports from the eBART and Somersville bridges over Somersville Road/Auto Center Drive. In order to ensure crew and public safety during this work, the contractor will close all lanes of Somersville Road/Auto Center Drive in the northbound and southbound directions between the westbound SR-4 on-ramp and the eastbound SR-4 on-ramp on Saturday evening, May 11 from 10:00 pm to 6:00 am, and Sunday evening, May 12 from 10:00 pm to 5:00 am.

The detours for this work will be as follows:

o Southbound motorists will be directed right on Century Boulevard, left on Delta Fair Boulevard to Somersville Road. For detour map, please see attachment.

o Northbound motorists will be directed left on Delta Fair Boulevard, right on Century Boulevard to Auto Center Drive. For detour map, please see attachment.

The SR-4 Widening Project includes over $540 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 SR-4 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 Antioch station at Hillcrest Avenue.

Caltrans and CCTA appreciate your patience as we work to improve the highways. For the most current information on all SR-4 corridor closures please visit our website at:

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