The jurisdiction of the Contra Costa Transportation Authority lies in the northeastern portion of the San Francisco Bay Area, covering approximately 804 square miles. It includes a mix of suburban cities, industrial corridors, and rural open space, with a population of just over 1.1 million. Its bordered by the Bay and Delta to the west and north, and the rolling hills and ridge lines of Mount Diablo to the east. Economic activity in Contra Costa is shaped by sectors such as oil refining and energy, health care, education, professional services, and a growing presence of advanced manufacturing and technology. The county also contains major regional job centers in cities like Walnut Creek, Concord, and Richmond.
Transportation infrastructure is anchored by key highway corridors such as I-80, I-680, and State Route 4, and is supported by BART, commuter rail, regional and local bus systems, and ferry service. The area’s varied geography and development patterns—from older industrial cities in the west to lower-density suburbs and unincorporated communities in the east—present both challenges and opportunities for transportation planning. Recent efforts have focused on enhancing transit access, reducing congestion, and coordinating land use with infrastructure investment to support long-term regional mobility.
The Contra Costa Transportation Authority (CCTA) is the countywide agency responsible for planning, funding, and delivering transportation improvements across Contra Costa County. Formed in 1988 following the passage of Measure C, and renewed with Measure J in 2004, CCTA manages the county’s half-cent transportation sales tax, which funds a wide range of transportation projects and programs. The Authority works in partnership with local jurisdictions, transit agencies, regional bodies, and the private sector to address congestion, improve mobility, and ensure the efficient movement of people and goods.
CCTA’s work spans highway and transit improvements, bicycle and pedestrian infrastructure, safe routes to schools, and emerging mobility initiatives. The agency leads long-range planning through its Countywide Transportation Plan and plays a central role in aligning local land use decisions with transportation investments. CCTA is also recognized for its innovation, including its efforts to advance connected and autonomous vehicle testing through the GoMentum Station in Concord. With a focus on sustainability, equity, and technology, CCTA supports a transportation system that serves diverse communities and adapts to the region’s evolving needs.
GoMentum Station. CCTA leads and facilitates a collaboration between between public and private partners to research, test, and commercialize the use of autonomous vehicles. Located in Concord, the GoMentum Station is the nation’s largest testing facility for AVs. The station spans 5,000 acres and offers 20 miles of paved road to pilot and replicate real-life scenarios in a safe and controlled environment. The deployment of AVs promotes safety and efficiency and provides environmentally sustainable solutions for Bay Area commuters. This project is particularly noteworthy because of CCTAs role in working with its communities to turn the unused weapons base as an important economic catalyst for Contra Costa County.
511 Contra Costa. 511 Contra Costa encourages a multimodal approach to commuting in Contra Costa. It helps users plan bike routes, research bus schedules and fares, and locating rideshare options. 511 Contra Costa promotes alternative modes of travel that result in reduced traffic congestion and improved air quality in the county. It is partially funded by Measure J, which is administered by CCTA. The 511 Commuter Program offers monetary incentives to employees within the county who switch from driving to an alternative mode of transportation for their commute to work at least one day a week.
The Board is comprised of 11 voting members. Two are appointed by the board of supervisors and one is appointed by the Conference of Mayors for Contra Costa County. The eight remaining seats are appointed by cities from four sub-regional planning committees that themselves are organized as joint powers authorities. See Transplan, Transpac, Western Contra Costa Advisory Committee, and the Southwest Advisory Committee (includes a county map of the sub-regions). In addition, the Board has 3 ex-officio member representing AC Transit, BART, and MTC.
1107 9th Street, Ste. 810
Sacramento, CA 95814
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