South Fork Noyo River, Sill Modification to Improve Fish Passage


SCH Number
Public Agency
Fish & Game #3
Document Title
South Fork Noyo River, Sill Modification to Improve Fish Passage
Document Type
NOE - Notice of Exemption
Document Description
The water diversion at the Jackson Demonstration State Forest, more notably, the subject's concrete sill, has proven to be, under low flow conditions, a barrier to migrating adult coho salmon. It should also be considered a passage issue for juvenile salmonids. Up to ten miles of stream course were not utilized by coho salmon because of this impediment. The Department will modify the sill by building a concrete weir type of structure on the downstream side of the sill which will result in a single pool fish ladder. The weir will be constructed with concrete and rebar. A low flow notch will be placed mid-channel to concentrate flow and facilitate passage.

Contact Information

Scott Wilson
Agency Name
Department of Fish and Game, Region 3
Contact Types
Lead/Public Agency



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 2, Section 15301(i)
Reasons for Exemption
Minor alteration of an existing structure to protect fish and wildlife resources.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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