Print This Page

Balfour Road

Construction Work

Nighttime construction work, closures, and detours will occur between 10pm and 5am.  Please be advised of construction signs along SR 4 and Balfour Road.  Please anticipate potential delays in your regular commute.


Project Description

The Contra Costa Transportation Authority (CCTA) will begin construction of the new Balfour Road Interchange at State Route 4 (SR4) in February 2017. The Balfour Road and State Route 4 intersection is currently signalized, resulting in significant backups during peak commute times. This project will eliminate the at-grade intersection by building an interchange at this location.

This is the final phase of bypass construction to improve traffic flow on State Route 4. The bypass projects on State Route 4 were developed cooperatively among Contra Costa Transportation Authority, and the cities of Brentwood, Antioch and Oakley to ease traffic congestion along State Route 4.


The new overpass will:

  • Reduce traffic congestion
  • Enhance motorist, cyclist and pedestrian safety

Costs and Funding

The total project budget is $73.6 million. Funding sources for this project include Measure J, the East Contra Costa Regional Fee and Financing Authority (ECCRFFA), and Contra Costa Water District (CCWD).


Construction will begin in early February 2017 and continue for approximately two years. Check back here for future updates on construction activities and traffic detours.


To sign up for the project notification list, please email

Questions? Call the project hotline at: (925) 756-0721

Stay Connected

Follow along at: