Issues



Issues that likely affect or potentially affect coho population and status:

Northern Subbasin:
Includes Outlet Creek confluence with the mainstem Eel to its confluence with Long Valley Creek. Outlet, Bloody Run, Long Valley, and *Dutch Henry creeks have or have had a coho presence.

Low summer and fall flows are exacerbated by dams in Outlet Creek’s headwaters in the Southern Subbasin, and water extraction and diversions throughout Outlet Creek;

Summer water temperatures exceed suitable ranges in some locations on the mainstem of Outlet Creek and its tributaries;

Sediment from poorly maintained roads and stream crossings throughout Outlet Creek are thought to be affecting instream habitat;

Stream banks are eroding due to the placement of roads and railroad lines adjacent to streams, absent or sparse riparian cover, and livestock trampling;

In 1995, DFG stream surveys found deficient canopy density on the lower reach of Outlet Creek and in some locations on the tributaries surveyed;

Natural and man-made barriers decrease available spawning habitat in the tributaries to lower Outlet Creek;

Fine sediment is still being transported downstream from the 1955 and 1964 floods and impacts the lower reach of Outlet Creek, which can be observed by widened floodplains, absent riparian and elongated sediment bars.

*There are two Dutch Henry creeks, one in the Northern and Middle Subbasin. Controversy exists on which Dutch Henry Creek was listed by Brown and Moyle (1991).

Recommendations


What watershed and habitat improvement activities would most likely lead toward more desirable conditions in a timely, cost effective manner?

Recommendations  Activities Alder Bloody Run  Cherry  Long Valley Outlet
Flow and Water Quality Conserve water during the summer and fall months.    X    X  X
  Identify and control unregulated water diversions and pumping.        X  X
  Reduce summer and fall water temperatures.    X    X  X
  Reduce identified organic and inorganic pollutants to streams        X X
Erosion and Fine Sediment Reduce bank erosion.  X  X  X  X  X
  Reduce fine sediment input from roads, culverts, and other land use activities.  X  X  X  X  X
  Reduce sediment input from debris slides where possible.          X
  Use exclusion fencing where streambank erosion is caused by grazing wildlife and livestock.  X  X  X  X  X
Riparian and Instream Habitat Re-vegetate stream banks to develop and expand canopy.  X  X  X  X  X
  Add large woody debris and other structure to increase cover and pool depth and frequency.  X  X  X  X  X
  Remove barriers to fish passage.        X  
Education, Research, and Monitoring Identify and map sediment sources.  X  X  X  X  X
  Develop and support water quality monitoring.  X  X  X  X  X
  Reinstall USGS stream flow gage          X
  Continue and expand water quality (temperature, dissolved oxygen, and fine sediment) monitoring.        X  X
  Continue efforts to develop watershed, landowner, and road association groups.  X  X  X  X