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

River, Grande Ronde/Imnaha, Lower Snake Mainstem Tributaries) for this species.
Historic populations above Hells Canyon Dam are considered extinct (ICBTRT 2003).
This ESU includes production areas that are characterized by spring-timed returns,
summer-timed returns, and combinations from the two adult timing patterns.
Historically, the Salmon River system may have supported more than 40% of the total
run of spring and summer Chinook salmon to the Columbia system (Fulton 1968).
Some or all of the fish returning to several of the hatchery programs are also listed,
including those returning to the Tucannon River, Imnaha River, and Grande Ronde River
hatcheries, and to the Sawtooth, Pahsimeroi, and McCall hatcheries on the Salmon River.
The Salmon River system contains a range of habitats used by spring/summer Chinook.
The South Fork and Middle Fork Salmon Rivers currently support the bulk of natural
production in the drainage. Returns into the upper Salmon River tributaries have
reestablished following the opening of passage around Sunbeam Dam on the mainstem
Salmon River downstream of Stanley, Idaho. The dam was impassable to anadromous
fish from 1910 until the 1930s. Table 11 identifies populations within the SR
spring/summer Chinook salmon ESU, their abundances, and hatchery input.
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