The State Route 4 Bypass project (Bypass) is a roadway project 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. It is expected that Caltrans will relinquish the existing highway and accept the Bypass as the new State Route 4 sometime between 2008 and 2010. The primary source of funds for the program is from fees collected on all new development in eastern Contra Costa County.
ASKED QUESTIONS (FAQ)
Being Proposed? The State
Route 4 Bypass (Bypass) – Phase 1 project is a large, regional transportation project
being constructed in three segments. Segment 1 extends from just
east of the SR4/Hillcrest Avenue Interchange to
Right of way is also being acquired
and/or preserved for the ultimate transportation corridor from SR4 on the
north end to Vasco Road on the south end to accommodate an 8-lane divided
freeway with transit in the median as well as land necessary for the future
interchanges at Sand Creek Road, Balfour Road, Marsh Creek Road and
are the Project Limits?
What are the Project Limits?The Bypass project starts approximately half way between the Hillcrest Avenue/SR4 Interchange in the City of
do we need the Project?
Why do we need the Project?The Bypass will accomplish the following:
access to the growing areas of southeast
traffic congestion in
improved local circulation/mobility for
The Bypass project, when complete,
will become the new State Route 4 through the Cities of Antioch and Brentwood
is the history of the project? The Bypass
was born out of the East County Corridor Study of the late 1980’s prepared by
Caltrans, Contra Costa and
is building the project?
Who is building the project?In 1989, the State Route 4 Bypass Authority was created through a Joint Powers Agency Agreement to deliver the SR4 Bypass Project. This agency, which includes
will the project be paid for?
How will the project be paid for?The principal source of revenue for the Bypass program is from a regional transportation-funding agency, the East Contra Costa Regional Fee and Financing Authority (ECCRFFA). This fee is currently collected on new development in eastern
any portions of the project been completed yet?
Have any portions of the project been completed yet?Phase 1 of the State Route 4 Bypass, as described above is now fully constructed.
is the Cost of the Project?
What is the Cost of the Project?The total estimated cost of Phase 1 of the SR4 Bypass Project is approximately $216 million. The first phase of Segment 1 is estimated to cost approximately $106 million when complete, the first phase of Segment 2 was around $29 million and the first phase of Segment 3 is estimated to cost $81 million. These costs include environmental, engineering, right of way acquisition, utility relocations and construction and construction management.
Project Map - Segment 3 (Balfour Road to Marsh Creek Road)
Project Map - Segment 3 (Marsh Creek Road to Vasco Road at Walnut Blvd)
Project Map - Segment 3 (Marsh Creek Road)