Oken Swale Maintenance Project
Summary
SCH Number
2025081132
Public Agency
Sonoma County Agricultural Preservation and Open Space District
Document Title
Oken Swale Maintenance Project
Document Type
NOE - Notice of Exemption
Received
Posted
8/26/2025
Document Description
The project will improve the capacity of an existing swale that drains through a rock-lined culvert inlet under the Rohnert Foothills Subdivision Unit No. 3 (G-Tract subdivision). Over time, the swale has filled from erosion, deposition, and vegetation growth, resulting in reduced capacity. This limited capacity has caused a concern that stormwater could potentially overflow into the neighboring properties during a large storm. The proposed work includes recapturing and expanding the swale capacity to reduce flood potential from overland flows off the adjacent field and expanding the existing berm to further protect residences from flooding.
Contact Information
Name
Sheri Emerson
Agency Name
Sonoma County Agricultural Preservation and Open Space District
Job Title
Stewardship Manager
Contact Types
Lead/Public Agency
Phone
Location
Cities
unincorporated area
Counties
Sonoma
Regions
Unincorporated
Cross Streets
5151 Petaluma Hill Road
Zip
94928
Total Acres
76
Parcel #
045-171-026, 045-171-037
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Sec. 15302 Replacement or Reconstruction
Reasons for Exemption
The proposed project is reconstruction of a drainage ditch to convey overland flow from a field to reduce flood risk. It will be located in the same location and convey the same or close to the same flow capacity. The project site is not located along a scenic highway and does not propose work surrounding hazardous materials or historic or cultural resources. The project is determined not to have a cumulative impact or significant effect on the environment.
County Clerk
Sonoma
Attachments
Notice of Exemption
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