Trinity River Partial Wing Dam Project


SCH Number
Public Agency
California Department of Fish and Wildlife, Northern and Eureka Region 1 (CDFW)
Document Title
Trinity River Partial Wing Dam Project
Document Type
NOE - Notice of Exemption
Document Description
The project is limited to the annual reconstruction of a seasonal partial wing dam within Trinity River for the purpose of maintaining a summer swimming hole for Ripple Creek Cabins. The partial wing dam spans approximately 35 linear feet and is approximately 4 feet in depth after construction. A backhoe is used to move large rocks, as needed. Each year in the summer months, local river rock is assembled to construct the partial wing dam. No materials are introduced to or removed from the channel of Trinity River, nor is the channel nor its stream flows ever blocked. Roughly two-thirds of the channel’s width remains opens, allowing flows to bypass the dam and fish to pass. High flows from precipitation in fall and/or winter topple the rock dam annually and disperse the rock to a more natural gradient.

Contact Information

Helen Bowman
Agency Name
California Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Trinity Center
Northern California
Parcel #
Trinity River

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Type – Class 2; California Code of Regulations, title 14, section 15302 (c)
Reasons for Exemption
The project involves the seasonal reconstruction of an existing private structure within the same general footprint as the structure replaced. There will be no change to the structure’s purpose and no or negligible change to its capacity.


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