West Marin Drainage Rehabilitation

3 Documents in Project


SCH Number
Lead Agency
Marin County
Document Title
West Marin Drainage Rehabilitation
Document Type
RC - Response to Comments
Present Land Use
ARP - Agriculture Residential Planned, APZ - Agriculture Production Zone
Document Description
The Marin County Department of Public Works is proposing to conduct maintenance activities to rehabilitate existing road pass-through culverts and repair eroded roadside embankments (slip-outs). The proposed project would address culvert deficiencies using a variety of maintenance treatment types specific for each location. Culvert maintenance treatment types may include: extending culvert outfall pipes to avoid flanking or undermining; grouting or lining culvert interiors; paving culvert inverts; replacing damaged sections or failed pipes in-kind; installing larger diameter pipes where culverts are undersized; repairing existing inlet drop structures placing rock riprap at culvert inlets and/or outlets; constructing concrete headwalls; and improving fish passage.

Contact Information

Betsy Swenerton
Agency Name
Marin County Department of Public Works
Job Title
Project Manager
Contact Types
Lead/Public Agency / Project Applicant


Unincorporated Areas
Cross Streets
Point Reyes-Petaluma Rd, Highway 1, Platform Bridge Rd, Lucas Valley Rd, Nicasio Valley Rd, Sir
Total Acres
State Highways
Highway 1
Lagunitas Creek, Nicasio Creek, San Geronimo Creek
Other Information
The Project area encompasses approximately 14 miles of roadway in West Marin County.

Notice of Completion

State Reviewing Agencies
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 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
Development Types
Other (Other (Drainage Culverts))
Local Actions
Master Plan, Culvert Rehabilitation
Project Issues
Aesthetics, Air Quality, Biological Resources, Coastal Zone, Cultural Resources, Drainage/Absorption, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Noise, Public Services, Recreation, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wildfire


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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