Bridge Scour Mitigation Project

Bridge Scour Mitigation Project

The California Department of Transportation (Caltrans) is proposing to perform scour mitigation and countermeasures on four bridges along Interstate 5 in Colusa County, State Route 20 in Sutter County, and State Route 70 in Butte County. Scour activity is causing degradation of the soil that provides lateral load support to the bridge foundations. Two of the four bridge structures are located on Hunters Creek on I-5 in Colusa County. Hunters Creek has an eroded north abutment slope and needs to be armored to prevent roadway stability. Sutter Bypass located along SR 20 in Sutter County is susceptible to closure due to column buckling and scour at high flows. To reduce the risk of column buckling and scour at high flows, rock slope protection would be placed at the west, middle, and east channels of the Sutter Bypass. The Dudley Creek bridge has a scour hole at the north abutment footing that needs to be armored to prevent undermining of the footing.

Oroville, Williams, Yuba City

Butte, Colusa, Sutter

Citywide, Countywide, Nationwide, Northern California, Unincorporated

California Air Resources Board (ARB), 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 Toxic Substances Control (DTSC), 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 Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Redding Region 5 (RWQCB), California State Lands Commission (SLC), California Transportation Commission (CATC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, California Department of Conservation (DOC), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)

California Department of Conservation (DOC), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)

Transportation:Highway/Freeway

SHOPP

Air Quality, Biological Resources, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Mandatory Findings of Significance, Noise, Transportation, Wetland/Riparian