Honey Lake Valley Resource Conservation District Johnstonville Dam Rehabilitation Project
Summary
SCH Number
2024120002
Public Agency
Honey Lake Valley Resource Conservation District
Document Title
Honey Lake Valley Resource Conservation District Johnstonville Dam Rehabilitation Project
Document Type
NOE - Notice of Exemption
Received
Posted
12/2/2024
Document Description
The Johnstonville Dam Rehabilitation Project area is located approximately 0.5
miles northwest of Johnstonville along the Susan River (NE 1/4, Section 11,
T.29N, and R.12E. MDMB). The Project is focused on improving the
Johnstonville Dam structure to facilitate safer and more efficient maintenance.
The structure is currently in poor condition based on the definitions used by the
National Inventory of Dams which the State of California advocates. The concrete
abutments are deteriorating and piping has occurred within the structure. The
operators using the flood control structure manually remove flashboards to release
flow downstream which is a safety hazard during high flow storm events. The
proposed design will include the following improvements: replacement of
wooden flashboards and checkboards with five tilting weir gates and supportive
concrete walls. To perform work in the river channel the project area will first be
dewatered prior to construction with the use of a temporary coffer dam or
approved alternate. Water from the Susan River will be diverted to the nearby AB
Canal (Lake Leavitt Inlet Canal). Additionally, a sheet pile wall will be installed
upstream of the dam and used to mitigate seepage. Construction is expected to
occur when the flows are low in the Susan River between the months of July to
December. This project aims to provide a design that allows for a safe and
efficient way to control flows at the Dam and to improve the structural stability of
the structure and prolong its functionality for Lassen Irrigation Company (LIC).
Contact Information
Name
Kelsey Siemer
Agency Name
Honey Lake Valley RCD
Job Title
District Manager
Contact Types
Lead/Public Agency
Phone
Location
Cities
Susanville
Counties
Lassen
Regions
Northern California
Zip
96130
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15301, which exempts operation and repair of existing facilities.
Reasons for Exemption
This review for dam rehabilitation activities concludes that project
implementation as designed would have less than significant impact in each
resource area. Class 1 exemption (CCR Section 15301) covers the operation,
repair, maintenance, permitting, leasing, licensing, or minor alteration of existing
public or private structures, facilities, mechanical equipment, or topographical
features, involving negligible or no expansion of existing or former use. The
Honey Lake Valley Resource Conservation District (RCD) has determined that
the objective of the project and the implementation activities as designed for this
project are continuing the operation and repair of existing facilities and therefore
fit within the CCR Section 15301 exemption. Additional environmental analysis
was conducted by Environmental Specialists regarding proposed project effects
on rare, threatened and endangered plants; threatened, endangered and special
status wildlife species; and cultural resources. The Honey Lake Valley Resource
Conservation District (HLVRCD) has reviewed these reports and determined that
the project’s implementation will result in multiple benefits. There will be no
significant adverse impacts on endangered, rare, or threatened species or their
habitats. There are no hazardous materials at or around the project site. The
project will avoid all archeological resource sites. The project will not result in
cumulatively significant impacts. The Project will have no significant adverse
effect on the environment.
County Clerk
Lassen
Attachments
Notice of Exemption
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