Yuba River North Training Wall Phase 2 Project

Yuba River North Training Wall Phase 2 Project

The North Training Wall (NTW) is an approximately 2.25-mile-long cobble embankment that was constructed by the California Debris Commission in the early 1900s to confine the Yuba River and facilitate downstream movement of mining debris within the floodway. Flood control was not an authorized purpose, but the NTW has historically provided and continues to provide flood risk reduction to the surrounding area. However, the height and width of the NTW have decreased over time. This reduction and ongoing, persistent erosion from storm events have combined to increase the flood risk to the Hallwood community, the City of Marysville, and portions of Reclamation District 10 (D-10). In early 2022, the Three Rivers Levee Improvement Authority (TRLIA) completed the NTW Phase 1 Project, which included reshaping the NTW embankment to provide a more stable geometry and address height and width reductions that had occurred over time and ongoing, persistent erosion from storm events. Completing this reshaping improved flood protection for the City of Marysville and portions of D-10 and substantially reduced flood risk to the community of Hallwood. The NTW reshaping was evaluated separately under the California Environmental Quality Act (CEQA) because it had independent utility and resources were available to complete the work. The Phase 2 project includes constructing a high ground tie-in embankment to extend the north end of the NTW upstream and form a contiguous line of protection that further reduces flood risk to the Hallwood community, the City of Marysville, and portions of D-10. Phase 2 also includes potential ecological enhancement components: riparian/aquatic habitat creation, fish passage enhancement, and salmonid foraging enhancement.

unincorporated

Yuba

Unincorporated

California Air Resources Board (ARB), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of State Parks, Division of Boating and Waterways, California Department of Transportation, District 3 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), California State Lands Commission (SLC), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality

Other (Flood Risk Reduction and Habitat Restoration)

Flood risk reduction

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire