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Contra Costa Transportation Authority

2999 Oak Road, Suite 100, Walnut Creek, CA 94597
(925) 256-4700 

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 to do countywide transportation planning.

CCTA is responsible for maintaining and improving the county’s transportation system by 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 is also the county's designated Congestion Management Agency (CMA), responsible for putting programs in place to keep traffic levels manageable.

We work to improve our quality of life and help make our community great – now and in the future.

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Standard Documents

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Upcoming Solicitations

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Number Deadline
CCTA Project No. 505: I-680/SR4 Interchange Improvements - Phase 3
Widen the median of State Route 4 in both directions from east of Milano Way/Glacier Drive to east of SR 242. Outside widening of SR 4 will occur in both directions at Pacheco Boulevard and I-680. The widening structural section includes aggregate subbase, aggregate base, permeable material, CTB, and a combination of PCC, AC, HAM, RAC-G paving. Concrete barriers including Midwest Guardrail System, Double Thrie Beam barrier, terminal systems, and crash cushion will be constructed. A combination of inside and outside widening of five bridges and the replacement of Grayson Creek bridge along with raising SR 4 profile in both directions from just east of I-680 to construct grading, RAC, In addition, the Project proposes replacing Grayson Creek Bridge and raising the profile of SR 4 from east of I-680 to east of Grayson Creek to 900 feet east of the new Grayson Creek bridge. Retaining walls, sign structures, signing, striping, electrical lightings, drainage, hydromodifications, bioswales, and electrical work under the Caltrans 2015 Standard Specifications and Standard Plan are to be constructed.
 08/29/2018 09:00 PM UTC
1 Solicitation

Closed Solicitations

Number Deadline
CCTA Project No. 491: I-680 HOV Lane Completion and Express Lane Conversion
General work description: Construct Grading, Aggregate Base, HMA Paving, Drainage, Concrete Barriers, Midwest Guardrail System, Terminal Systems, Crash Cushions, Bridge Widening, MSE Retaining Wall, Soldier Pile Retaining Wall, Soil Nail Retaining Wall, Sign Structures, Signing, Striping and Electrical work under the Caltrans 2015 Standard Specifications and Standard Plans.
 06/13/2018 09:00 PM UTC
I-680 Plant Establishment Period: CCTA Project No. 478
General work Description: Plant establishment period under the Caltrans 2015 Standard Specifications and Standard Plans.
02/15/2018 07:00 PM UTC
I-680 Tree Removal: CCTA Project No. 476
General work description: Tree Removal under the Caltrans 2015 Standard Specifications and Standard Plans.
10/10/2017 06:00 PM UTC
I-80 Central Avenue Operational Improvements: CCTA Contract No. 463
General work description: install roadside signs and variable message signs, install and modify traffic signals, remove and replace pavement markings and striping, and electrical work under the Caltrans 2010 Standard Specifications and Standard Plans.
06/29/2017 06:00 PM UTC
4 Solicitations