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

Critical Habitat
Critical habitat for these salmon was designated on December 28, 1993 (58 FR 68543).
This critical habitat encompasses the waters, waterway bottoms, and adjacent riparian
zones of specified lakes and river reaches in the Columbia River that are or were
accessible to listed SR fall-run salmon (except reaches above impassable natural falls,
and Dworshak and Hells Canyon Dams). Adjacent riparian zones are defined as those
areas within a horizontal distance of 300 ft from the normal line of high water of a stream
channel or from the shoreline of a standing body of water. Designated critical habitat
includes the Columbia River from a straight line connecting the west end of the Clatsop
jetty (Oregon side) and the west end of the Peacock jetty (Washington side), all river
reaches from the estuary upstream to the confluence of the SR, and all SR reaches
upstream to Hells Canyon Dam. Critical habitat also includes several river reaches
presently or historically accessible to SR fall-run Chinook salmon. Limiting factors
identified for SR fall-run Chinook salmon include: (1) Mainstem lower Snake and
Columbia hydrosystem mortality, (2) degraded water quality, (3) reduced spawning and
rearing habitat due to mainstem lower SR hydropower system, (4) harvest impacts, (5)
impaired stream flows, barriers to fish passage in tributaries, excessive sediment, and (6)
altered floodplain and channel morphology (NMFS 2005). The above activities and
features also introduce sediment, nutrients, biocides, metals, and other pollutants into
surface and ground water and degrade water quality in the freshwater, estuarine, and
coastal ecosystems throughout the Pacific Northwest.
Snake River Spring/Summer­Run Chinook Salmon
Distribution
SR spring/summer-run Chinook salmon are primarily limited to the Salmon, Grande
Ronde, Imnaha, and Tucannon Rivers in the SR basin (Figure 14). The SR basin drains
portions of southeastern Washington, northeastern Oregon, and north/central Idaho.
Environmental conditions are generally drier and warmer in these areas than in areas
occupied by other Chinook salmon species. The ICBTRT has identified 32 populations
in five MPGs (Upper Salmon River, South Fork Salmon River, Middle Fork , Salmon
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