Mattole Headwaters Flow Enhancement Project

6 Documents in Project


SCH Number
Lead Agency
Humboldt County
Document Title
Mattole Headwaters Flow Enhancement Project
Document Type
NOD - Notice of Determination
Document Description
North Fork Lost River Flow and Habitat Enhancement (WCB Project ID: 2021039). The Project will restore geomorphic, hydrologic, and ecological processes to about 5,200 feet of Lost River to address limiting factors affecting salmonid production. Stream flow benefits will be achieved through installation of instream channel-spanning structures with subsurface clay restrictive layers and incorporation of a modified Stage 0 approach. Two terrace ponds will be constructed to provide metered flow into the project reach during the lowest flow period between August and October. Channel entrenchment and disconnected floodplains will be reduced and partially eliminated in the reaches designed with channel spanning structures totaling about 3,055 linear feet.

Contact Information

John P. Donnelly
Agency Name
Department of Fish and Wildlife, Wildlife Conservation Board
Contact Types
Responsible Agency


Other Location Info
The specific project site under this MND to be funded by WCB is on a forested reach of the North Fork Lost River, a tributary to the Mattole River headwaters in Mendocino County. The Lost River watershed is located approximately 21 road miles southwest of Garberville and Highway 101, near the town of Whitethorn.

Notice of Determination

Approving Agency
Wildlife Conservation Board
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Final Environmental Document Available at
3015 H street Eureka, CA 95501


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA


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