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SJ 4 Detour— Construction Project between Old River and Middle River Bridge <br /> Full Closure <br /> Westbound 4 closed at Tracy Blvd (Soft Closure) <br /> Westbound 4 closed just west of Middle River Bridge (Hard Closure) <br /> Westbound 4 Detour <br /> Tracy Blvd South to 1-205 West <br /> 1-205 West then Exit Grant Line Road <br /> Grant Line Road Exit, Turn West on Naglee Road <br /> Naglee Road West to Grant Line Road West <br /> Grant Line Road West to County Road J 14 (Byron Rd. Hwy.)North <br /> Countv Road J 14 (Byron Rd. Hwy.) North to State Route 4 West <br /> Eastbound 4 closed at County Road J14 (Byron Rd. Hwy.) (Soft Closure) <br /> Eastbound 4 closure at Discovery Bay Blvd(Hard Closure) <br /> Eastbound 4 Detour <br /> South County Road J 14 (Byron Rd. Hwy.)to West Grant Line Road (East) <br /> West Grant Line Road East to I-205 East <br /> Exit Tracy Blvd. turn North on Tracy Blvd. <br /> Tracy Blvd (North)return to Eastbound 4. <br />