State Route 4 Bypass

The State Route 4 Bypass project is being developed by a cooperative effort between Contra Costa County and the Cities of Antioch, Brentwood and Oakley. The purpose of the Bypass is to ease traffic congestion in Brentwood and Oakley and to provide access to the growing areas of southeast Antioch and western Brentwood. The Bypass will replace existing State Route 4 from just south of the Main Street Interchange to the existing intersection with Marsh Creek Road.

Related Links:

State Route 4 Bypass Authority