Sonoma 121 Safety Improvements Project


SCH Number
Lead Agency
California Department of Transportation, District 4
Document Title
Sonoma 121 Safety Improvements Project
Document Type
NEG - Negative Declaration
Present Land Use
transportation corridor

Document Description
The purpose of this safety project is to reduce occurrences of cross-centerline collisions. The project is divided in 3 segments. Segments 1 and 3 both have drainage work, and segment 3 is proposed to have the MBGR upgraded to MGS. For segment 2, there are two proposed alternatives for roadway realignment. For alternative 1, the proposed alignment would shift slightly towards the eastern side of SR 121 and there would be two retaining walls on the eastern side and a two-way left turn lane after the entrance to a winery business. For alternative 2, the horizontal curve will be straightened towards the western side of SR 121, and then realigned to the eastern side of the highway; two retaining walls are proposed, one on the eastern side and one on the western side of SR 121. Segments 1 and 3 are identical in both build alternatives.

Contact Information
Arnica MacCarthy
California Department of Transportation, District 4
Lead/Public Agency
111 Grand Avenue
Oakland, CA 94623-0060

Phone : (510) 286-7195


Cross Streets
Arnold Dr (SON 121) and Bisso Rd
Parcel #
128-451-040, 142-122-001
State Highways
SR 121
Other Location Info

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation:Other (roadway safety improv)
Project Issues
Aesthetics Agriculture and Forestry Resources Biological Resources Cultural Resources Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Noise Public Services Transportation Vegetation Wetland/Riparian
Reviewing Agencies
Air Resources Board, Transportation Projects California Department of Conservation (DOC) California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW) California Department of Parks and Recreation California Highway Patrol California Native American Heritage Commission (NAHC) California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB) California State Lands Commission (SLC) Caltrans, Division of Aeronautics Department of Water Resources Office of Historic Preservation Resources Agency State Water Resources Control Board, Division of Water Quality State Water Resources Control Board, Division of Water Rights

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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