Final two lanes of Highway 4 (Bypass), Balfour Road interchange completed, now open

The two new southbound lanes of Highway 4 between Sand Creek and Balfour Roads in Brentwood opened today, Saturday, July 21, 2018.

Brentwood, CA – The Contra Costa Transportation Authority (CCTA) has completed the first stage of construction on the Balfour Road Interchange Project, and has opened newly constructed lanes to the public as of Saturday morning. This major project milestone is part of a $42.7 million-dollar construction project to improve safety and efficiency at this busy intersection in Brentwood.

A traffic switch will occur this weekend that will move eastbound Highway 4 drivers onto the newly built, elevated alignment over Balfour Road. Additionally, eastbound Highway 4 motorists will be able to use newly constructed on and off-ramps. A new signal will be activated at the intersection of Balfour Road and the new off-ramp, and directional signage will be in place to help inform motorists.

“This is a big deal for Brentwood”, said Brentwood Mayor Bob Taylor. “Balfour Road is a major intersection, and the opening of these new lanes bring us one step closer to making this a better, safer intersection for drivers, bicyclists and pedestrians.”

“Our goal is to help keep Contra Costa moving”, stated CCTA Executive Director Randy Iwasaki. “The Balfour Road Interchange Project is the final piece in the modernization of Highway 4 that our agency has led over the past eight years – and we are excited to be delivering on our promise to the public by bringing improved mobility to eastern Contra Costa County.”

The new Balfour Road on- and off-ramps from and to southbound Highway 4 opened today, Saturday, July 21, 2018.

“We purchased the right-of-way for the four lanes of traffic and two lines of transit down the center, 20 years ago, this year,” said Allen Payton, Chairman of the State Route 4 Bypass Authority in 1998. “Half of that section, of what was known as the Highway 4 Bypass, was paid for with local developer fees. The other half was to be paid for with state funds. But that commitment took years to be fulfilled. Special thanks go to Randy Iwasaki for helping secure the money from the state and to the CCTA for getting the project completed.”

A portion of the funds to complete the project were from Measure J, the county’s half-cent sales tax for transportation which is allocated by the CCTA. The effort for the project began in the early 1990’s and took until 1998 to get approval from the CCTA Board of Directors, without any financial commitment at that time.

Visualizations of the new eastbound on and off-ramps, as well as eastbound through traffic can be viewed online at:

Traffic on westbound Highway 4 towards Antioch will remain on the same alignment and continue to operate without any changes at this time. The entire project is expected to be complete in late 2018 or early 2019.

About the Highway 4 Projects

The Highway 4 projects include improvements that will help modernize eastern Contra Costa County. The projects expand Highway 4 from four to eight lanes between Loveridge Road in Pittsburg to just west of State Route 160 in Antioch, from two to four lanes from Lone Tree Way to Balfour Road in Brentwood, add missing connector ramps at the State Route 160/Highway 4 interchange, and add a BART extension from Pittsburg to Antioch with a new stop in Pittsburg and Antioch. This will greatly improve transit accessibility for the region, help reduce traffic congestion, and enhance the quality of life for the more than 250,000 residents of eastern Contra Costa County. The projects have been carefully staged to keep 130,000 vehicles per day moving as major construction and demolition work continue. These projects, plus previously constructed projects in the region, bring the total investment in East County to $1.3 billion, including State, Federal, Contra Costa Transportation Authority Measures C and J, regional bridge tolls, and other funds. View the story of Highway 4 at

About the Contra Costa Transportation Authority

The Contra Costa Transportation Authority (CCTA) is a public agency formed by Contra Costa voters in 1988 to manage the county’s transportation sales tax program and oversee countywide transportation planning efforts. With a staff of twenty people managing a multi-billion dollar suite of projects and programs, CCTA is responsible for planning, funding and delivering critical transportation infrastructure projects and programs that connect our communities, foster a strong economy, increase sustainability, and safely and efficiently get people where they need to go. CCTA also serves as the county’s designated Congestion Management Agency, responsible for putting programs in place to keep traffic levels manageable. More information about CCTA is available at

Share this:
Share this page via Email Share this page via Stumble Upon Share this page via Digg this Share this page via Facebook Share this page via Twitter

the attachments to this post:

New Balfour Road on & offramps

Hwy 4 new lanes open


No Comments so far.

Leave a Reply