Caldecott Tunnel Bores 1, 2, and 3 Rehabilitation and Ventilation Upgrade
Historic photo of the Caldecott Tunnel bores 1,2 and 3
Final Environmental Document
The Final Environmental Document (Initial Study Mitigated Negative Declaration / Environmental Assessment Finding of No Significant Impact) is available for review and can be viewed at the State Clearinghouse Website at https://ceqanet.lci.ca.gov/Project/2025010114 or can be downloaded via the button below.
Final Environmental Document (FED) Download
The Memorandum of Agreement (MOA) between Caltrans and the State Historic Preservation Officer regarding this project is also available for download below.
Memorandum of Agreement (MOA) Download
The Notice of Determination for the project is available for download below.
Notice of Determination (NOD) PDF Download
Printed copies of the Final Environmental Document, for onsite review, can be found at:
Caltrans District 4 Office (111 Grand Avenue, Oakland)
Public Meeting Information
A public meeting was held on January 22, 2025, in person and virtually. Please see the recording of the meeting on the right side of your screen.
Caldecott Tunnel Public Meeting Replay
Project Overview
Caltrans proposes to rehabilitate the Caldecott Tunnel Bores 1, 2 and 3 to preserve the structural integrity of the tunnel, improve ventilation performance and firefighting operational response, and extend its service life.
Project Scope
The project rehabilitation scope includes, removing, and repairing cracks in the concrete, addressing rust and fixing water damage in tunnel walls and ceilings. Construction will also make improvements to the electrical and lighting systems within the tunnel. The fire safety aspect of the project includes installing new jet fans for tunnel ventilation and sprinkler system as fire suppression.
Purpose and Need
The purpose of this project is to preserve the structural integrity of the tunnel, improve ventilation performance and firefighting operational response, and extend its service life. The project is needed because Headquarters Structure Maintenance and Investigation (SM&I) and District 4 identified deficiencies during inspection and concluded that the three bores required upgrades. If not addressed, the deficiencies would trigger more frequent maintenance and lead to more extensive repairs in the future. An independent consultant, WSP, was tasked by the Division of Engineering Services (DES) and District 4 to perform a risk analysis exploring the ventilation capacities of the Complex Tunnel/Tubes within the State of California to address smoke from vehicle fires of current commercial vehicles. The risk analysis concluded that Caldecott Tunnel Bores 1, 2, and 3 are of the top risk priority in the State and recommended ventilation upgrades.
Project Details
- Draft Environmental Document (DED): January 2025 (Tentative)
- Project Approval and Environmental Document (PA&ED): June 26, 2025
- Plans, Specifications, and Estimate (PS&E): May 2026 (Tentative)
- Ready to List (RTL): June 2026 (Tentative)
- CTC Funding Allocation: August 2026 (Tentative)
- Construction Start: Fall 2026 (Tentative)
- Construction End: Fall 2029 (Tentative)
- Project Funding: SB1 SHOPP, Infrastructure Investment and Jobs Act (IIJA)
Project Limits
The construction project will take place in the Caldecott Tunnel in Bores One, Two and Three on Highway 24 between Alameda and Contra Costa County.
Project Partners and Key Stakeholders
- Caltrans
- FHWA
- State Fire Marshall
- Alameda Fire Department
- Contra Costa Fire Department
Caldecott Tunnel Bores Current Conditions
Current condition of bore 1
Current condition of bore 2
Current condition of bore 3
Project Contact
Hector Chinchilla
Public Information Officer
Caltrans Bay Area ( District 4)
Email: hector.chinchilla@dot.ca.gov