Cardinal Road Levee Upgrade Project

Cardinal Road Levee Upgrade Project

The Coyote Creek levee system was constructed by the U.S. Army Corps of Engineers in the mid-1960s for the purpose of protecting a portion of the Tamalpais Valley community from high flows in Coyote Creek and Nyhan Creek as well as from high tides from Richardson Bay. After the system was constructed, ownership was transferred to the Marin County Flood Control and Water Conservation District, which has been responsible for operation and maintenance of the system ever since. The purpose of the proposed Project is to address chronic seepage issues and flood risk associated with Coyote Creek and tidal backwater from Richardson Bay, which will provide long-term adaptation capacity for projected mid-century sea level rise. The 5.9-acre Project site includes a portion of Coyote Creek and surrounding tidal marsh habitat; ornamental, native, and ruderal vegetation; and developed areas. The Project includes installing a sheet pile floodwall along a 1,100-foot segment of the existing Cardinal Road levee, improving a maintenance path adjacent to the levee, installing a new storm drain system to convey stormwater flows, removing two concrete drain boxes and culverts along the levee, and replacing an existing culvert with a new culvert that will include a pipe seal to prevent leakage through the floodwall.

Tamalpais-Homestead Valley

Marin

San Francisco Bay Area, Unincorporated

California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights

Other (Stormwater and food control infrastructure)

Project approval

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