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

pugettensis). An NPDES permit is required for application, and although the registration
allows application anywhere in the state, these locations are the only ones covered under
active permits. There has been some discussion of phasing out carbaryl use and replacing
it with alternative pesticides.
Harvest impacts on Puget Sound Chinook salmon populations average 75% in the earliest
five years of data availability and have dropped to an average of 44% in the most recent
five-year period (Good, Waples et al. 2005). Populations in Puget Sound have not
experienced the strong increases in numbers seen in the late 1990s in many other ESUs.
Although more populations have increased than decreased since the last BRT assessment,
after adjusting for changes in harvest rates, trends in productivity are less favorable.
Most populations are relatively small, and recent abundance within the ESU is only a
small fraction of estimated historic run size.
Atmospheric deposition
Pesticides were detected in wet deposition (rain) (Capel, Ma et al. 1998), and snow
samples from Mount Rainier National Park, Washington (Hageman, Simonich et al.
2006). Three of the four most frequently detected pesticides were found in the Mount
Rainier snow (dacthal, chlorpyrifos, and endosulfan).
Oregon­Washington­Northern California Coastal Drainages
This region encompasses drainages originating in the Klamath Mountains, the Oregon
Coast Mountains, and the Olympic Mountains. More than 15 watersheds drain the
region’s steep slopes including the Umpqua, Alsea, Yaquina, Nehalem, Chehalis,
Quillayute, Queets, and Hoh rivers. Numerous other small to moderately sized streams
dot the coastline. Many of the basins in this region are relatively small. The Umpqua
River drains a basin of 4,685 square miles and is slightly over 110 miles long. The
Nehalem River drains a basin of 855 square miles and is almost 120 miles long.
However, systems here represent some of the most biologically diverse basins in the
Pacific Northwest (Kagan, Hak et al. 1999; Belitz, Hamlin et al. 2004; Carter and Resh
2005).
259