Our new Biological Assessment is out - Klamath Basin Crisis

Klamath Project Operations Biological Assessment
Coho Salmon: Coho Salmon Life History, Abundance, and Trends
on the Trinity River, and up to 25 natural-origin coho salmon smolts at the Big
Bar Rotary Screw Trap (Table 3-6 and Figure 3-5), located at river mile 51 on the
main stem of the Klamath River.
Figure 3-3. Passage timing distributions of coho salmon smolts at three main stem
Klamath River Trapping locations. Mean passage dates and associated standard
deviations for all available years of trapping data (1998 to 2005) were used to derive the
normal distributions shown here.
40
Percentage of total smolt passage
30
20
10
Bogus Cr. (Rkm 304)
Kinsman Cr. (Rkm 235)
Big Bar (Rkm 82)
0
Feb-1 Mar-1 Apr-1 May-1 Jun-1 Jul-1 Aug-1
Figure 3-4. The rotary screw trap on Willow Creek, a tributary of Trinity River.
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