Sonoma 1 Culvert Rehabilitation Project

3 Documents in Project


SCH Number
Lead Agency
Caltrans, District 4 - Bay Area/Oakland (California Department of Transportation, District 4)
Document Title
Sonoma 1 Culvert Rehabilitation Project
Document Type
NEG - Negative Declaration
Present Land Use
Transportation Corridor

Document Description
The proposed project is located along State Route (SR) 1 in Sonoma County, California, from post mile (PM) 30.8 to 40.6. The scope of the project is to replace 23 existing damaged or failed culverts (from south to north) between Mill Gulch and 0.5 mile south of Miller Creek. The purpose of the project is to preserve the structural integrity of SR 1 within the project corridor and to prevent localized highway failures. The project is needed to replace 23 existing damaged or failed culverts that were determined to have deficiencies and require replacement to prevent further damage and possible failure of the highway. Addressing these deficiencies would prevent failure of the culverts and undermining of SR 1 or localized flooding and would avoid impacts to the safety of the traveling public.

Contact Information
Arnica MacCarthy
Caltrans District 4
111 Grand Ave
Oakland, CA 94612

Phone : (510) 286-7195


Cross Streets
Fort Ross Rd., Rossen Rd., Timber Cove Rd., Ninive Dr., Lee Dr., Kelly Ct. , Ruoff Rd., Pacific
State Highways
Fort Ross School
Mill Gulch, Fort Ross Creek, Stockhoff Creek, and Timber Cove Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation (Culvert Rehabilitation)
Local Action
Coastal Permit
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Coastal Zone Drainage/Absorption Forest Land/Fire Hazard Geologic/Seismic Greenhouse Gas Emissions Noise Public Services Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Land Use Cumulative Effects
Reviewing Agencies
Air Resources Board, Transportation Projects Cal Fire California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Parks and Recreation California Highway Patrol California Native American Heritage Commission California Regional Water Quality Control Board, North Coast Region 1 California State Lands Commission Department of Toxic Substances Control Department of Water Resources Office of Historic Preservation Resources Agency State Water Resources Control Board, Division of Water Quality


Environmental Document
1K730_IS-ND_6   PDF 9303 K Summary Form   PDF 98 K
NOC   PDF 903 K

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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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