Thermalito Afterbay Radial Gate Programmatic Refurbishment


SCH Number
Lead Agency
Water Resources, Department of (California Department of Water Resources)
Document Title
Thermalito Afterbay Radial Gate Programmatic Refurbishment
Document Type
NOE - Notice of Exemption
Project Applicant
California Department of Water Resources (DWR)

Document Description
As maintenance of the River Outlet Structure DWR proposes to refurbish each radial gate and their actuators, replace the anchorage system, extend the upstream stop-log guide extensions, repair the upstream concrete spalling, and correct a design flaw in the stop-logs. Bays will be dewatered during work.

Contact Information
Robin Carter-Ervin
Department of Water Resources
460 Glen Drive
Oroville, CA 95966

Phone : (530) 534-2570


Other Location Info
Thermalito Afterbay(THA) Dam/River Outlet Structure; staging will be in the large turnouts adjacent to Access Bridge.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 (m), § 15301. Existing Facilities
Reasons for Exemption
This is a maintenance project that consists of repairs to an existing structure. This project will not include work in water and no material from work will enter the waterway. There will not be any impact to fish, wildlife or cultural resources.


Notice of Exemption
2020010279_NOE_THA Radial Gate Refurb_signed   PDF 556 K

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