Rossi Bridge Repair RDS25-25
Summary
SCH Number
2025081149
Public Agency
Napa County
Document Title
Rossi Bridge Repair RDS25-25
Document Type
NOE - Notice of Exemption
Received
Posted
8/26/2025
Document Description
The proposed fix involves removing the impoundment and concrete box culvert and clear spanning Conn Creek. Permits have been applied for with CDFW, RWQCB and the Army Corp however they may not be processed in time to remove the impoundment this coming winter. The County hopes to acquire permits this year so the impoundment can be removed before it fails and pollutes the creek but at a minimum plan to drill 3-36" holes beyond each top of bank and construct the concrete abutments this year while staying outside of top of bank and if needed complete remaining work in the channel once permits are received. Working in the channel will require dewatering and it is anticipated that material will be removed from the roadway by an excavator as it retreats. The channel will be blended to match the geometry just beyond the up and downstream faces of the impoundment. This area will be replanted and monitored after project completion. The final stage of the project will involve launching a prefabricated steel truss bridge across the roadway and
paving new approaches to the bridge.
The project area encompasses approximately 1.72 acres which includes the Rossi Road Bridge over Conn Creek as well as adjacent private lands, which are primarily agricultural and vineyard properties. The project site and surrounding area is primarily riparian vegetation as well as some vineyards. Best Management Practices and erosion control measures will be implemented, as well as environmental commitments noted in the Biological Report to protect environmental resources, including any potential special-status species or cultural resources that may occur in the proposed area of work. The County is actively working with the United State Army Corp of Engineers to obtain the necessary 404 permit, as well as with the California Department of Fish and Wildlife on the necessary 1602 permit, and the California State Water Resources Control Board for the necessary 401 permit.
Contact Information
Name
Dana Eleanor Morrison
Agency Name
County of Napa
Job Title
Supervising Planner
Contact Types
Lead/Public Agency
Phone
Name
Dewey Phan
Agency Name
Napa County Public Works Department
Job Title
Assistant Engineer
Contact Types
Parties Undertaking Project
Phone
Location
Coordinates
Cities
St. Helena, unincorporated area
Counties
Napa
Regions
Unincorporated
Cross Streets
Conn Valley Road and Rossi Road
Zip
94574
Total Acres
1.72
Jobs
1
Parcel #
025-190-004-000; 025-190-003-000; 025-180-045-000
State Highways
None
Railways
None
Airports
None
Schools
None
Waterways
Conn Creek, Napa River, Spring Valley Creek and Moore Creek
Township
08N
Range
05W
Section
28
Base
MDM
Other Location Info
The project is location on Rossi Road, 0.1 miles northeast of Conn Valley Road in St. Helena, Napa County, California. The project location is identified on the St. Helena, California 7.5-minute quadrangle U.S. Geological Survey (USGS).
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
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 allow repair work and improve public safety and ensure the bridge remains safe for use by the Napa County residents and visitors to the area. Therefore, it has been determined that the proposed project qualifies for both 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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