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