Swamp Rodent Culverts

2 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 9 (DOT)
Document Title
Swamp Rodent Culverts
Document Type
MND - Mitigated Negative Declaration
Document Description
The California Department of Transportation (Caltrans) proposes to replace two culverts along a portion of SR 178 near Onyx. Existing 18” diameter corrugated metal culverts will be replaced with 24” diameter plastic (HDPE) culverts. The new culvert at PM 72.7 will be extended approximately 10 feet at the inlet and 3 feet at the outlet. The new culvert at PM 72.79 will be extended approximately 1 foot at the inlet and 2 feet at the outlet. Metal flared end sections (FES) will be installed at the inlets. The outlets will not have FES installed. Existing culverts will be used as a water diversion while the new culverts are being placed. The new culverts will be approximately 6 to 12 inches from the existing culverts. Excavated material will be placed over culverts on side slopes. New culverts will be covered by concrete slurry to within 4 to 6 inches of the roadway surface; the final coverage will be minor concrete.

Contact Information

Kristopher Bason
Agency Name
Caltrans District 9
Job Title
Associate Environmental Planner
Contact Types
Lead/Public Agency / Project Applicant


Southern California
State Highways

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 9 (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, Central Valley Fresno Region 5 (RWQCB), California State Lands Commission (SLC), California Transportation Commission (CATC), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, Sierra Nevada Conservancy, 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
Development Types
Transportation:Other (Culvert replacement on State Highway)
Local Actions
Transportation Improvements
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Economics/Jobs, 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, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire


Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
Notice of Completion [NOC] Transmittal form

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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