Thermalito Afterbay Brood Pond 4 Culvert Rehab
Summary
SCH Number
2025091357
Public Agency
California Department of Water Resources
(DWR)
Document Title
Thermalito Afterbay Brood Pond 4 Culvert Rehab
Document Type
NOE - Notice of Exemption
Received
Posted
9/30/2025
Document Description
The project will excavate and remove existing 36” corrugated metal pipe (CMP) and concrete headwall. CMP excavation trench will be 7-feet in depth and 6-feet in width.
Replace existing headwall and metal culvert with two new 5-foot by 5-foot precast concrete headwalls with attached wingwalls and galvanized steel slide gates, and 22’ long by 36” diameter reinforced concrete pipe (RCP).
The new culvert and headwalls will require an excavated trench with a 2:1 slope. The disturbed area will be mostly within the uplands and will be about 24’ wide by 30’ long. Estimated 1,860 cubic feet of material in total will be stockpiled on the west parking area, all stockpiled material will be reused to close the trench.
Equipment staging will be on the access road to the west and east of the project area.
If water surface elevations cannot be lowered below 128 feet, a coffer dam will be constructed. Construct 4-foot high, 9-foot-wide wall around work area on the Afterbay side of the dam. The coffer dam is made of an inflatable dual wall polyethylene tube that is filled with water. No in-water work will occur.
Contact Information
Name
Robin Carter-Ervin
Agency Name
DWR Environmental Scientist
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency / Project Applicant
Phone
Location
Cities
Oroville
Counties
Butte
Regions
Northern California
Cross Streets
South Wilbur Road
State Highways
HWY 162
Waterways
Thermalito Afterbay, Feather River
Township
19N
Range
3E
Section
32
Other Location Info
Thermalito Afterbay Brood Pond 4
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Existing Facilities Class 1, Section 15301
Reasons for Exemption
Class 1 exempts actions that consists of, but is not limited to, repair, maintenance, or minor alteration of existing facilities that will not result in significant impacts to environmental resources. This project’s purpose is to repair the existing culvert and headwall on the Brood Pond 4 dam. No sensitive species or habitats will be impacted and there will be no in-water work.
County Clerk
Butte
Attachments
Notice of Exemption
Disclaimer: The Governor’s Office of Land Use and Climate Innovation (LCI) 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. For more information, please visit LCI’s Accessibility Site.