10-1L660 Alpine County State Route 4 Drainage System Restoration Project

The Alpine County State Route 4 Drainage System Restoration project, identified as EA 10-1L660 and Streambed Alteration Agreement EPIMS Notification No. ALP-66225-R2, is a forecast procurement managed by Caltrans District 10 in Stockton. The project focuses on the restoration of drainage systems along State Route 4 between Post Mile 3.70 and 14.36, and State Route 207 at Post Mile 0.41 and 1.25 in Alpine County, California. The primary scope of work involves the replacement or rehabilitation of 14 existing culverts, which includes regrading inlet and outlet channels, installing rock slope protection, and upgrading end treatments and headwalls. Additionally, the project requires the removal of riparian vegetation, including mature trees. The California Department of Fish and Wildlife has issued a Notice of Determination dated July 6, 2026, concluding that the project will not have a significant environmental effect within its jurisdiction. This determination was based on a mitigated negative declaration provided by the lead agency, Caltrans District 10, with specific mitigation measures imposed as conditions for approval. The project is categorized under NAICS code 237310. While the project is currently listed as a forecast, specific contract values, performance periods, and detailed evaluation factors have not been disclosed in the available documentation.