Caltrans, highway 1-1, Rattlesnake Creek Fish Passage Project


SCH Number
Public Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
Caltrans, highway 1-1, Rattlesnake Creek Fish Passage Project
Document Type
NOE - Notice of Exemption
Document Description
The purpose of the proposed project is to replace and upgrade a degraded fish ladder on the outlet side of the concrete arch culvert at the Rattlesnake Creek Bridge. The fish ladder and concrete apron have been damaged and are on the verge of complete failure and appear to be hindering fish passage. Caltrans proposes to remove the existing fish ladder and construct a new weir system designed to improve fish passage. In addition, the proposed project would include lengthening the wing walls on the arch culvert and installing rock slope protection (RSP) to stabilize the culvert walls and hill slope opposite the outfall. Additionally, willow plantings will be incorporated into the proposed project, along the RSP and stream banks. The project will result in 2,726 feet^2 (89 linear feet) of permanent impacts to waters of the U.S. and waters of the State. The permanent impacts are associated with the installation of the RSP and the weirs, which are ultimately designed to improve the habitat and upstream mobility of multiple species of fish, primarily salmon and steelhead.

Contact Information

Jeremiah Puget
Agency Name
Regional Water Quality Control Board, Region 1 (North Coast), Sa
Contact Types
Lead/Public Agency



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec 15302(c)
Reasons for Exemption
Existing Highway with minor expansion of facility for the purpose of fish habitat restoration.

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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