Mirabel Water Diversion Structure General Maintenance Project
Summary
SCH Number
2024030833
Public Agency
Sonoma County Water Agency
Document Title
Mirabel Water Diversion Structure General Maintenance Project
Document Type
NOE - Notice of Exemption
Received
Posted
3/21/2024
Document Description
The nature of the project would be general routine maintenance activities for the Sonoma Water’s Mirabel water diversion structure (inflatable dam, fish ladder and intakes). The maintenance activities would primarily include the removal of gravel deposited on top of and adjacent to the inflatable dam and any needed repairs to the dam to continue the operational function of the water diversion structure. The gravel removal would occur during low flow condition when the work area is not inundated by the active flows of the Russian River. The inflatable dam is a critical component of the Sonoma Water’s water supply system for over 600,000 people in the region. Gravel material deposited on top of and adjacent to the dam after winter high flows does not allow the dam to be raised without causing damage to the dam. There often is not a lot of lead time as flows recede between being able to see how much material is on top of the dam and when the dam needs to be raised to meet community water supply demands. Sonoma Water is pursuing long-term routine maintenance permits for this maintenance.
Contact Information
Name
Yvette O'Keefe
Agency Name
Sonoma County Water Agency
Job Title
Senior Environmental Specialist
Contact Types
Lead/Public Agency / Project Applicant
Phone
Email
Location
Counties
Sonoma
Regions
Northern California, Unincorporated
Other Location Info
The project site is located at the Sonoma County Water Agency’s (Sonoma Water) Mirabel water diversion facilities at 10290 Westside Road, Forestville, California, approximately seven miles west of Highway 101.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15301 Existing Facilities (b)
Reasons for Exemption
The project would result in the operation, repair, maintenance, and permitting of an existing public structure (Mirabel water diversion structure) that provides public utility services (water supply), involving negligible or no expansion of existing or former use. The gravel removal would occur during low flow condition when the work area is not inundated by the active flows of the Russian River.
County Clerk
Sonoma
Attachments
Notice of Exemption
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