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Balfour Road

Project Description

The Contra Costa Transportation Authority (CCTA) is beginning construction of the new Balfour Road Interchange at Highway 4. The Balfour Road and Highway 4 intersection is currently signalized, resulting in traffic backups during peak commute times. This project will replace the at-grade intersection with a new interchange at this location.

This is the final phase of bypass construction to improve traffic flow on Highway 4. The bypass projects on Highway 4 were developed cooperatively among the Contra Costa Transportation Authority, and the cities of Brentwood, Antioch, and Oakley to ease traffic congestion along Highway 4. To view a video rendering of the interchange, please watch below.

To view more video renderings, please visit Videos.

To view monthly construction progress photos, please visit Photos.

Project Benefits

The new overpass will:

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

Construction Work

Construction work continues during the week, Monday through Friday with occasional weekend work, as needed.  Daytime work takes place from 6:30 am to 5:00 pm.  Nighttime work occurs from 8:00 pm to 5:00 am and continues until Saturday, August 26th.  At least one lane in each direction remains open at all times.

The Contractor is currently widening Balfour Road to the North.  Construction crews have installed temporary concrete traffic barriers to separate construction activities from traffic on Balfour Road.

Construction signs are in place along Highway 4 and Balfour Road.  Please anticipate delays during your regular commute and upcoming travel

Upcoming Construction Activities*

Balfour Road:

  • Anticipated Construction Hours:
    • Monday – Friday: Night work from 8:00 pm to 5:00 am
    • Friday: Night work 8:00 pm Friday to 8:00 am Saturday
  • Nighttime Construction:
    • Nighttime construction continues Mondays through Fridays until Friday, August 25th.
      • Potable water pipe installation on Westbound Balfour Road through August 25th
      • Drainage work from Wednesday, August 16th through Friday, August 25th

*All construction work subject to weather conditions.

Costs and Funding

The total construction  budget is $42.7 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 Spring 2017 and is expected to be complete in late 2019.  Check back here for future updates on construction activities and traffic detours.

Fact Sheet

To download a fact sheet about the Balfour Road Interchange project, please click below.









To sign up for the project notification list, please email

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

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