Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

Status and Trends
UWR steelhead were listed as threatened in 1999 (64 FR 14517). Their classification
was retained following a status review on January 5, 2006 (71 FR 834). A major threat to
Willamette River steelhead results from artificial production practices. Fishways built at
Willamette Falls in 1885 have allowed Skamania-stock summer steelhead and earlymigrating
winter steelhead of Big Creek stock to enter the range of UWR steelhead. The
population of summer steelhead is almost entirely maintained by hatchery salmon,
although natural-origin, Big Creek-stock winter steelhead occur in the basin (Howell,
Jones et al. 1985). In recent years, releases of winter steelhead are primarily of native
stock from the Santiam River system.
Steelhead in this DPS are depressed from historical levels, but to a much lesser extent
than are spring Chinook in the Willamette basin (McElhaney, Chilcote et al. 2007). All
of the historical populations remain extant and moderate numbers of wild steelhead are
produced each year. The population growth rate data indicate long-term trends are