Bridge Scour Mitigation Project

The Bridge Scour Mitigation Project, identified as Minor Alteration No. WA2025057, involves bridge strengthening operations at the State Route 20 bridge, also known as Sutter Bypass Bridge No. 18-0005. Located in Sutter County between S Tarke Road and W Butte Road, the project is authorized under Permit 16764 and complies with California Code of Regulations, Title 23, Article 3, Section 6 for work within an adopted plan of flood control. The scope of work specifically requires the retrofitting of 14 bridge bents, each consisting of five 16-inch diameter column piers, with steel bracing installed parallel to the stream flow. Caltrans serves as the lead agency and project applicant, with the Central Valley Flood Protection Board acting as the responsible agency. On August 15, 2025, the Board issued a Notice of Determination stating that the project would not have a significant environmental effect, based on a Mitigated Negative Declaration prepared by Caltrans. The project is categorized under NAICS code 237310 and is managed by Caltrans District 3 in Marysville and Sacramento, with performance taking place in Yuba City, California.