South Fork Ten Mile River Habitat Enhancement Project, Phase 2


SCH Number
Public Agency
California Regional Water Quality Control Board, North Coast Region 1 (RWQCB)
Document Title
South Fork Ten Mile River Habitat Enhancement Project, Phase 2
Document Type
NOE - Notice of Exemption
Document Description
This Project is the third phase of implementation of The Nature Conservancy’s larger reach-wide habitat enhancement program in the lower 1.7 miles of the South Fork Ten Mile River with a goal of increasing survival and populations of coho salmon. This phase includes the following habitat enhancements immediately downstream of the Phase 1 improvements: 1) A long, deep alcove and shallow pond will be constructed to connect to the existing seasonal pond and valley wall wetland complex along the left valley edge; 2) The dry, rarely flooded 1965 gravel deposit on the left bank will be excavated out to create a 1.6-acre, tidal-bore flooded wetland. The wetland surface get flooded daily during high tides and during nearly every storm event; 3) A small alcove set into a wide, tree-covered gravel bench will be constructed to provide complex, low-velocity, off-channel winter habitat in the upper project reach; and 4) Four accelerated recruitment-type large wood structures will be constructed to increase channel bedform and habitat complexity in the long glide reach. A mix of downed alder, willow slash, and whole redwood trees will be used to form the structures. The Project also includes implementation of adaptive management measures at two locations in the Phase 1 project area, including: 1) The inlet at the off-channel, seasonally flooded wetland will be excavated to inundate at baseflow conditions to make the constructed side channel accessible to salmonids through a full range of future winter conditions. The inlet will be deepened about 3 feet. The excavated floodplain material will be trucked to the quarry located along the mainstem Ten Mile River. Monitoring indicates the habitat feature is limited to accessibility during high flows only. The inlet adjustment will provide additional accessible habitat for salmonids; and 2) Alcove Pilot Channels. Monitoring indicates pilot channels are needed in the constructed alcove to create a network of channels through alcove to make the upper alcove more accessible to salmonids.

Contact Information

Jake Shannon
Agency Name
North Coast Regional Water Quality Control Board
Job Title
Sr. Environmental (Scientist)
Contact Types
Lead/Public Agency


Fort Bragg
Northern California

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 33; California Code of Regulations, Title 14, section 15333
Reasons for Exemption
This restoration project does not to exceed five acres in size and will assure the restoration, enhancement, and maintenance of coho salmon habitat.
County Clerk


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