Mattole Headwaters Flow Enhancement Project

4 Documents in Project


SCH Number
Lead Agency
Humboldt County
Document Title
Mattole Headwaters Flow Enhancement Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
LU: timberland, rural community center, residential estates, res ag, Z: Timberland production zone & unclassified
Document Description
Note: Review Per Lead This project will address impacts of past land management, climate change and drought in the Mattole River at a scale needed to restore summertime stream flows in the headwaters. Since 1999 a pattern of low summertime flows in the Mattole River headwaters has caused the river to dry up in some reaches, leaving disconnected pools and poor water quality in the remaining reaches. This prolonged-dry season low-flow pattern has had devastating impacts on the already threatened native salmon populations in the Mattole, for which the headwaters are the most critical spawning and rearing grounds. While measurable streamflow improvements have been made through the successful storage and forbearance program, restoration of ground and surface water hydrology is also needed to achieve drought resilience. Several of the fish-bearing tributaries in the Mattole headwaters that experience extreme low to no flows do not have any human development or diversions of any kind and therefore addressing land use impacts is the only strategy available for improving flows. To address the situation, Sanctuary Forest Inc. is planning to conduct a flow enhancement/restoration project in the Mattole River headwaters (project). The project objectives include improved groundwater recharge/storage and enhanced summer streamflow along with increased riparian vegetation and associated fish and wildlife benefits in the upper Mattole River and its tributaries. The project has been designed to increase the streambed elevation and promote the formation of complex meandering stream and wetlands. Note: See MND for full project description.

Contact Information

Holly Merrifield
Agency Name
Humboldt County
Contact Types
Lead/Public Agency


Cross Streets
Briceland Thorne Rd
Total Acres
Parcel #
215-172-003-000 et seq.
Whitehorn ES
Upper Mattole River and tributaries
Other Location Info

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
Cal Fire, California Department of Conservation (DOC), California Department of Fish and Wildlife, Eureka Region 1 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 1 (DOT), California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, North Coast Region 1 (RWQCB), California State Lands Commission (SLC), Department of Fish and Wildlife, Marine Region, Department of Water Resources, Office of Historic Preservation, Resources Agency, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights
Development Types
Other (restoration/flow enhancement)
Local Actions
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Geology/Soils, Mineral Resources, Public Services, Transportation, Wetland/Riparian, Wildlife

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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