Our new Biological Assessment is out - Klamath Basin Crisis

Klamath Project Operations Biological Assessment
Coho Salmon: Effects of the Proposed Action on Coho Salmon
the flows required to provide for the maximum available juvenile habitat, when
applied directly to this study site (Table 3-24 and Appendix Table 3-D-9). This
would not include additional flows from tributaries. Increased flows from IGD
above the proposed minimum required flows would further reduce available
juvenile habitat at this study site.
In regards to the available fry habitat, the proposed minimum flows, when applied
directly to this study site, again with no inflows from all tributaries, would result
in at least 35 to 36 percent of the available habitat throughout the entire year
(Figure 3-23). At the minimum flow levels, any additional flows from tributaries
would provide additional available fry habitat.
Modeled flows at the 50 percent exceedence level under the Proposed Action,
when applied directly to this study site, would provide for 35 to 51 percent of the
available fry habitat. During the March through June critical time period of smolt
out-migration, modeled flows, at the 50 percent exceedence level under the
Proposed Action (2008 to 2018), when applied directly to this study site, would
provide for between 37 to 51 percent of the available fry habitat.
For this study site, the Proposed Action will provide for a balance between
increased flows to provide for additional fry habitat and increased flows which
would further reduce the available juvenile habitat. When expanding the sitelevel
results to estimate the available habitat for the entire study reach, by
applying the results of Hardy and Addley’s (2006) aerial photogrammetry image
acquisition and digital terrain modeling, the percentages of available habitat at a
given flow were similar (Appendix 3-D-13 and summarized in Table 3-25).
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