SACRAMENTO -- The U.S. Army Corps of Engineers Sacramento District has completed the Draft Supplemental Environmental Assessment (SEA) and Finding of No Significant Impact (FONSI) for the Lower San Joaquin River, California Project (LSJR), Tenmile Slough Reach 30L (TS30L) Alternate Haul Route. With the release of the Draft SEA, a public review period of ten days will be open from July 30 to August 11, 2025.
The Draft SEA provides information regarding an analysis of a proposed alternate haul route along E. Main Street and Copperopolis Road for transporting materials from a previously identified Stockton East Water District (SEWD) borrow site to the TS30L construction site and potentially future levee repair sites. This alternative haul route is proposed as a backup to the planned haul route should it become unfeasible for continued use.
Furthermore, the FONSI states after all laws, executive orders, regulations and local government plans were considered, the proposed action would have no significant effect on wetlands or other regulated Waters of the United States (WOTUS), cultural resources, federally listed species or their critical habitat, or other natural or physical resources.
The Lower San Joaquin River Project is a flood risk management project led by the U.S. Army Corps of Engineers and in partnership with the Central Valley Flood Protection Board (CVFPB), the California Department of Water Resources (DWR), and the San Joaquin Area Flood Control Agency (SJAFCA). In collaboration, all agencies are working to advance the project by providing 24 miles of levee improvements along the Sacramento-San Joaquin Delta Front and two closure structures, one at Fourteenmile Slough and the other at Smith Canal. The levee improvements include cutoff walls, seismic remediation, a new levee, levee geometry improvements and erosion protection.
Previously, the LSJR Project area has experienced major flood events in 1955, 1958 and 1997 which resulted in severe damage. The current levee system protects over 71,000 acres of missed-use land, about 235,000 people and an estimated $28.7 billion in damageable property. The entirety of the LSJR Project is expected to reach completion by 2039.
Instructions on how to provide comments for review can be found within the Draft SEA. To review the Draft SEA and FONSI and learn more about the LSJR Project, please visit the project website: https://www.spk.usace.army.mil/Missions/Civil-Works/Lower-San-Joaquin-River/.
Release no. 25-014