Redwood Road MPM 5.41 Slide Repair Project RDS26-22
Summary
SCH Number
2026070974
Public Agency
Napa County
Document Title
Redwood Road MPM 5.41 Slide Repair Project RDS26-22
Document Type
NOE - Notice of Exemption
Received
Posted
7/24/2026
Document Description
Winter storms in 2024-2025 caused a small landslide that undermined about 33 feet of the roadway edge, leaving part of the asphalt unsupported and creating a steep drop down to a private driveway. The slide repair will include installing a Rock Slope Protection (RSP) buttress and restoring the damaged section of the Redwood Road. The RSP is proposed to be constructed at a 1:1 slope, about ten feet high, averaging five feet in thickness. Following installation of the downslope RSP, the damaged road
surface will be filled and repaved. Roadway reconstruction will extend about 100 feet, and the existing roadway ditch will be lined with asphalt to reduce erosion.
Although repair work will be conducted within the boundaries of Redwood Road, the Project does not propose to change the alignment or create visual or audible changes to the landscape, maintaining the integrity of the road and its ability to convey its potential historic significance. While some vegetation will be impacted by the Project, no trees will be removed. After completion of the RSP buttress, the disturbed area
at the slide area below the roadway will be hydro seeded with native mix of grasses. Best Management Practices and erosion control will be implemented, as well as environmental commitments to protect environmental resources, including any potential special-status species or cultural resources that may occur in the project area.
Contact Information
Name
Dana Eleanor Morrison
Agency Name
County of Napa
Job Title
Supervising Planner - Conservation
Contact Types
Lead/Public Agency
Phone
Name
Dewey Phan
Agency Name
Napa County Public Works Department
Job Title
Assistant Engineer
Contact Types
Project Applicant / Parties Undertaking Project
Phone
Location
Coordinates
Cities
Napa, unincorporated area
Counties
Napa
Regions
Northern California, Unincorporated
Cross Streets
Redwood Road and Mark Elk Ranch Road
Zip
94558
Total Acres
1
Parcel #
Public ROW between APNs: 034-110-019, 034-120-003, 034-120-017, 034-120-015
State Highways
None
Railways
None
Airports
None
Schools
None
Waterways
Pickle Creek, Redwood Creek, Dry Creek, Carneros Creek and Browns Creek
Township
06N
Range
05
Section
22+27
Base
MDM
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301 Class 1-Existing Facilities and Section 15302 Class 2 - Replacement or Reconstruction
Reasons for Exemption
Pursuant to CEQA Section 15300, the proposed project would be considered
Categorically Exempt based on at least one Exemption Class. The project site is not recognized as an important wildlife corridor by any regional or state agency or jurisdiction and is not considered critical to the ecological functioning of adjoining open space areas. However, the project site likely supports local movement patterns of terrestrial wildlife species and provides food and cover resources for common avian
and amphibian species. Temporary effects due to noise and increased human activity during project activities would not interfere with these local movement patterns over time or affect the ability of these species to forage or reproduce, various BMPs including biological monitoring, awareness training and protocol level surveys have been included as part of the project. The project site is not listed on any hazardous waste sites enumerated under Government Code Section 65962.5. As a result, there is no reasonable possibility that the project will have a significant effect on the environment.
The proposed improvements would be considered Categorically Exempt from CEQA pursuant to Section 15301 Class 1-Existing Facilities, which includes the operation and repair of existing public or private structures or facilities involving negligible or no expansion of existing of former use. The proposed improvements would also be considered Categorically Exempt pursuant to Section 15302, Class 2-Replacement or Reconstruction, which consists of replacement or reconstruction of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure replaced. A key consideration in the appropriateness of using these Categorical Exemptions is whether the project would be located on the same site have substantially the same purpose and involves negligible or no expansion of an existing use. In terms of negligible expansion, the proposed project will generally take place within the existing facility's footprint and does not include significant expansions beyond existing conditions. The proposed project would restore the travel lane width and legal load capacity of the existing facility to improve public safety and would bring
the facility into compliance with current Road and Street Standards. Therefore, it has been determined that the proposed project qualifies for a Class 1 and Class 2 Categorical Exemption and has no reasonable possibility of having a significant effect on the environment.
County Clerk
Napa
Attachments
Notice of Exemption
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