Project Information
Overview
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.
FREQUENTLY
ASKED QUESTIONS (FAQ)
What is
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 Lone
Tree Way in the City of Antioch
and will consist of a 6-lane freeway between existing SR4 and
the Laurel Road Interchange and a 4-lane freeway from there to Lone
Tree Way . Phase 1 of Segment 2 has been
constructed as a 2-lane Expressway from Lone Tree
Way to Balfour
Road with plans to convert it to a full freeway
with interchanges at Sand
Creek Road and Balfour
Road . Segment 3
extends from Balfour Road south to Marsh Creek Road as a 2-lane Expressway,
then along Marsh Creek Road (East-West Connector) as a 2-lane
conventional highway, connecting to existing SR4 (Byron
Highway). In addition, Vasco
Road has been extended from Walnut
Boulevard to Marsh
Creek Road to directly connect to the Bypass at Marsh
Creek Road .
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
Walnut/Vasco Road.
What
are the Project Limits? The Bypass
project starts approximately half way between the Hillcrest Avenue/SR4
Interchange in the City of Antioch and the
Main Street/SR4 Interchange in the City of Oakley
and continues south to Marsh
Creek Road (approximately 8.5 miles) in the City
of Brentwood in eastern Contra
Costa County . The Bypass continues
on Marsh Creek Road
(upgraded roadway) to its intersection with existing SR4 ( Byron
Highway ), approximately 12.4 miles in total
length.
Why
do we need the Project? The Bypass
will accomplish the following:
1) Provide
access to the growing areas of southeast Antioch
and western Brentwood ;
2)
Ease
traffic congestion in Antioch , Brentwood
, and Oakley; and
3) Provide
improved local circulation/mobility for Antioch , Oakley and Brentwood
residents.
The Bypass project, when complete,
will become the new State Route 4 through the Cities of Antioch and Brentwood
and Contra Costa
County . It is anticipated that Caltrans will adopt
the Bypass as the new State Route 4 and relinquish the existing highway in
the 2009/2010 time frame
What
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 Alameda Counties , the City of Antioch
, Brentwood and Livermore
and the Contra Costa Water District. The study identified feasible
alternatives for a transportation corridor between State Route 4 in eastern
Contra Costa to Interstate 580 in Alameda
County . A preferred alternative was adopted in the
study and the northern part of this alternative became the initial alignment
of the Delta Expressway, later known as the State Route 4 Bypass. The Bypass is being developed and
constructed by a cooperative effort between Caltrans, Contra
Costa County
and the cities of Antioch ,
Brentwood and Oakley.
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 Contra
Costa County
and the Cities of Antioch ,
Brentwood and Oakley, has been working with
Caltrans since the 1989 to implement the project.
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 Contra
Costa County
. (See
June 9, 2016 Agenda Packet)
Have
any portions of the project been completed yet? Phase 1 of the State Route 4 Bypass, as described above is now fully
constructed.
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 1
Project Map - Segment 2
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)
Aerial Map - Segment 1,
2 & 3
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