HUDSON SPILLWAY MODIFICATION - ENG26-00006
Summary
SCH Number
2026061310
Public Agency
Napa County
Document Title
HUDSON SPILLWAY MODIFICATION - ENG26-00006
Document Type
NOE - Notice of Exemption
Received
Posted
6/30/2026
Document Description
This permit is to approve a Grading permit for the proposed Hudson Spillway
Modification, the project has already obtained a Lake and Stream bed Alteration agreement from the California Department of Fish and Wildlife; Agreement number 1600-2020-0108-R3, pursuant to Section 1602 of the Fish and Game Code to Hudsonia. The project is limited to decommissioning an existing approximately 120-foot long, 13-foot-wide concrete spillway of an on-stream reservoir (reservoir) and constructing a new approximately 215-foot long, 13-foot-wide concrete spillway. The California Division of Safety of Dams is requiring that the project relocate the spillway off the face of the earthen dam for safety reasons. The new spillway inlet will be relocated approximately 175 feet to the west, and the spillway will outlet into the
unnamed tributary at approximately the same location as the existing spillway. At the new spillway outlet, an approximately 30-foot diameter, 2,115 square-foot stilling basins composed of 245 cubic yards of 8-inch diameter rock riprap will be constructed within the stream channel to prevent scour during reservoir spills. At the top of the dam face and at the inlet to the new spillway, an approximately 13-foot long, 16-foot-wide steel bridge will be constructed across the spillway to allow for vehicular access. At the south end of the stilling basin, an approximately 36-foot long, 14-foot wide free-span steel bridge (i.e., Residential Bridge) with concrete abutments located outside top of bank will be constructed. Additionally, 155 cubic yards of 8- inch diameter rock riprap will be placed in the channel and along the banks underneath the bridge to prevent channel erosion. Project will utilize Best Management Practices and erosion control measures.
Contact Information
Name
Dana Eleanor Morrison
Agency Name
County of Napa
Job Title
Supervising Planner - Conservation
Contact Types
Lead/Public Agency
Phone
Name
Robert Lee Hudson
Agency Name
Property Owner
Job Title
Property Owner/Applicant
Contact Types
Project Applicant / Parties Undertaking Project
Phone
Email
Location
Coordinates
Cities
Napa, unincorporated area
Counties
Napa
Regions
Northern California, Unincorporated
Cross Streets
State Highway 12 and Old Sonoma Road
Zip
94559
Total Acres
1.0
Parcel #
047-060-009-000 & 047-070-023-000
State Highways
State Highway 12
Railways
0
Airports
0
Schools
0
Waterways
Huichica Creek, Carneros Creek, Buhman Creek, and Congress Valley Creek
Township
05N
Range
05W
Section
24
Base
MDM
Other Location Info
5396 Sonoma Highway, Napa, Ca 94559
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15303 Class 3-New Construction or Conversion of Small Structures
Reasons for Exemption
The Project meets the CEQA criteria for exemption from environmental
review under Class 3, Section 15303. This section of the guidelines describes New Construction or Conversion of Small Structure. This Project consists of construction and location of a limited number of new small facilities and structures as required by the California Division of Safety of Dams. The project site is not listed on any hazardous waste sites enumerated under Government Code Section 65962.5.
County Clerk
Napa
Attachments
Notice of Exemption
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