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Fisheries Projects

The Scott River watershed supports anadromous fish runs for three salmonid (Oncorhynchus) species: Chinook salmon (O. tshawytscha), Coho salmon (O. kisutch) and steelhead trout (O. mykiss). Scott River coho salmon are part of the Southern Oregon Northern California Coast (SONCC) Coho Evolutionarily Significant Unit, which was listed as threatened under the Federal Endangered Species Act in 1997, and again under the California Endangered Species Act in 2004.

Monitoring

Anadromous fish species are monitored during freshwater life stages through direct observation spawning ground surveys and dive surveys.  Spawning ground surveys conducted in the valley portion of the Scott River Watershed (upstream of the Scott River Fish Counting Facility) are focused on collecting spawning distribution data (range and relative density), run data (sex ratio, age composition, hatchery contribution) and biological data (length, prespawn mortality, tissue samples).  Dive surveys are focused on determining habitat utilization and relative abundance of juvenile fish.

 

Spawning ground surveys targeting coho salmon were initiated on the Scott River in the winter of 2001 as a cooperative effort among local organizations, landowners, and agencies. At that time it was recognized that baseline population and run data was needed in order to implement and assess restoration plans and efforts specific to the species.  These surveys have documented the presence of spawning adults throughout the watershed and been the primarily means by which the suspected historic range of the species has been evaluated and refined.

 

Annual Reports for the Scott River Coho Salmon Spawning Ground Surveys can be found in the Resource  Library.

 

Instream Habitat Enhancement

Off-channel Rearing Ponds - The purposed of off-channel ponds is to provide thermal refugial habitat for summer rearing and velocity refugial habitat for over-wintering such that the capacity and productivity of tributary habitat is increased.

Large Woody Complexity - Projects are designed to mimic natural stream conditions that produce shelter for rearing salmonids through the use of locally sourced tree trunks, rootwads and brush bundles.

Fish passage improvement - Projects include improvements to road crossings through the installation of a rock ford and improvements to diversions structures through the installation of a series of boulder weirs.

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