The Solano Transportation Authority announced Sunday it has awarded a $24.9 million contract for the State Route 37/Fairgrounds Drive Interchange Improvement Project.
STA, in partnership with the City of Vallejo, California Department of Transportation, Metropolitan Transportation Commission (MTC), and Solano County, awarded the contract to Bay Area contractor Ghilotti Construction Company, Inc. Construction is expected to begin this month.
This project will implement a Diverging Diamond Interchange design at the intersection of State Route 37 and Fairgrounds Drive to significantly improve traffic flow and safety while reducing congestion.
This Diverging Diamond Interchange will be the first in the Bay Area. Beyond improving traffic flow and reducing congestion, this project is expected to provide continuous Class II bicycle lanes and pedestrian facilities and improve mobility access for historically disadvantaged communities by increasing connections to regional transit, employers, and the greater Vallejo Area.
The contract comes four months after the groundbreaking ceremony in the parking lot of Six Flags Discovery Kingdom.
The project supports a larger countywide effort to revitalize the Solano County Fairgrounds and encourage economic growth and development, which will develop a mixed-use neighborhood with space for commercial establishments, public facilities, and multi-unit housing along with a transit mobility hub. The interchange project was awarded RM3 bridge toll funds, with Solano County as a project partner.
Construction on the State Route 37/Fairground Drive Interchange Improvements Project is anticipated to start in late March, with completion by mid-2026. Pre-construction work, including tree removal, will begin in early March. Landscape improvements will be made at the conclusion of construction.
For more information about the project and to view a video explaining the design, visit sta.ca.gov/project/redwood-parkway-fairgrounds-dr-improvement-project/.
