Slip-out Repair and Bank Stabilization Near 1780 Higgins Canyon Road Project

Slip-out Repair and Bank Stabilization Near 1780 Higgins Canyon Road Project

The proposed project consists of road repairs, bank stabilization, and habitat enhancement along the southwestern bank of Mills Creek adjacent to the northeastern side of Higgins Canyon Road in San Mateo County. Approximately 110 linear feet of creek bed, 185 feet of creek bank, and 180 feet of roadway have been eroded and require repair. The objective of the Project is to repair the damaged road and restore the bed and failed bank of Mills Creek. The proposed Project involves: 1) an approximately 192-linear-foot-long soldier pile retaining wall, 2) an approximately 185-foot, biostabilization-based bank repair (soil lifts and vegetated boulder revetments),3) approximately 110 linear feet of engineered creek bed to restore the channel to its pre-erosional original flowpath, and 4) reconstruction of approximately 180 linear feet of failed roadway within the existing footprint to restore the travel lane and shoulder area. The project would remove approximately 2,116 square feet of the asphalt from the existing compromised roadway on the northeastern edge of the road where it is affected by the slip-out. This would be replaced with approximately 4,556 square feet of new asphalt, including the failed pavement area. The finished roadway would be restored to its original width of approximately 20 feet wide.

Half Moon Bay

San Mateo

Countywide

California Air Resources Board (ARB), California Coastal Commission (CCC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Marin Region 7 (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 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), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality

Other (creek bank repair and restoration), Transportation:Local Road (road repair)

Coastal Permit

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Coastal Zone, Cultural Resources, Drainage/Absorption, Energy, 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, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire