State Route 4 Old River Bridge Additional Maintenance

Project Description

The California Department of Transportation (Caltrans) proposes to preserve the Old River Bridge (Number 29-0045) on post mile 0.01 at the San Joaquin and Contra Costa County line on State Route 4. Preserving the bridge would include a polyester concrete overlay and painting the bridge. The old timber waling and the fenders on the north side of Pier 3 would be replaced, and the south side of Pier 2 would be supported with new high-density polyethylene walers mounted to the existing timber piles. An abandoned Caltrans-owned one-car garage on the southwest levee would be removed. The approach rail on both sides of the bridge would be replaced with the current standard Midwest Guardrail System.


Project Benefits


The purpose of this project is the preservation of Old River Bridge (Number 29-0045) to ensure its serviceability and structural integrity.


The Old River Bridge (Number 29-0045) has transverse and pattern deck cracks, rust on steel members, and a deteriorated fender system. As such, the project is needed to repair or replace these worn or defective parts that threaten the bridge’s serviceability and structural integrity.


Funding Source

The project was programmed in the 2020 State Highway Operations and Protection Program (SHOPP) with funding from the SHOPP Stewardship Program Category, Bridge Health Program Code.


Project Cost/Programmed

Programed Project Cost Capital $ Support $
Project Approval & Environmental Document $0 $1,591,000
Plans, Specifications, & Estimates $0 $1,495,000
Right of Way $495,000 $0
Construction $7,801,000 $2,480,000


Current Schedule

 Process Date
Project Study Report (M010) Summer 2017 (Actual)
Project Approval & Environmental Document (M200) March 2023 (Actual)
Right of Way Certification (M410) April 2024
Ready to List (M460) May 2024
Approved Construction Contract (M500) November 2024
Project Completion (M600) October 2026


Project Status

The project is scheduled to RTL in May 2024. Construction should begin in spring 2025.


Project Contact

Caltrans District 10 - Public Information Office
Phone: (209) 948-7977



Initial Study with Proposed Negative Declaration - July 2022 (1,315KB)


Title VI Information

The California Department of Transportation (Caltrans) assures that no person shall, on the basis of race, color, or national origin, be excluded from participation in, be denied the benefits of, or be otherwise subjected to discrimination under any program or activity receiving Federal financial assistance, as required by Title VI of the Civil Rights Act of 1964, as amended, the Civil Rights Restoration Act of 1987, and Federal Executive Order 12898 (Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations).

Caltrans will make every effort to ensure nondiscrimination in all of its programs and activities, whether they are federally funded or not, and that services and benefits are fairly distributed to all people, regardless of race, color, or national origin. In addition, Caltrans will facilitate meaningful participation in the transportation planning process in a nondiscriminatory manner.