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Klamath Project Operations Biological Assessment Coho Salmon: Effects of the Proposed Action on Coho Salmon the Shasta and Scott Rivers. Thus, the estimated available habitat when applying these flows directly to these sites or reaches should be considered conservative. The exceedence tables for the Shasta and Scott Rivers contributions from 1961 to 2004 are also shown in Appendix Table 3-D-15 and Appendix Table 3-D-16, respectively. IGD to Shasta River Reach The “R. Ranch” site in Hardy and Addley (2006) is within the main stem of the Klamath River between IGD and the confluence of the Shasta River. Based on the Hardy and Addley (2006) study site-level results, the minimum flows proposed under the Proposed Action would provide for at least 55 percent (occurring July through September; Figure 3-20 and Appendix Table 3-D-7) to 65 percent (occurring in March through June) of the available juvenile habitat. The minimum flows proposed under the Proposed Action would also provide for at least 66 percent (occurring July through September; see Appendix Table 3-D-7) to 81 percent (occurring in April and May) of the available fry habitat, within this study site. At the minimum flows and at this study site, additional flow would provide further habitat for both coho salmon juvenile and fry. However, it is noted that in most years, the annual flows will be much greater than the cumulative monthly minimum flows represent. When viewed over the entire year, modeled flows at the 50 percent exceedence level under the Proposed Action (2008 to 2018) would provide for at least 56 to 80 percent of the available juvenile habitat and 67 to 100, or down to 99 percent of the available fry habitat. The “down to” 99 percent value indicates flows above the maximum available fry habitat flow. At flows above the maximum available habitat level, increase flow would further reduce available fry habitat at this study site. During the March through June critical time period of coho salmon smolt outmigration, modeled flows at the 50 percent exceedence level under the Proposed Action (2008 to 2018) would provide for at least 67 to 80 percent of the available juvenile habitat and 85 to 100 or down to 99 percent of the available fry habitat, within this study site. 245
Klamath Project Operations Biological Assessment Coho Salmon: Effects of the Proposed Action on Coho Salmon Figure 3-20. Estimated percent of the maximum available habitat for juvenile (top graph) and fry (bottom graph) coho salmon in the R Ranch study site under the proposed minimum flows and at the 50 percent modeled exceedence level under the Proposed Action. 100 Percent of Maximum Available Habitat 80 60 40 20 0 Study Site R. Ranch - Juvenile Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Month Proposed Minimum Flows 50 Percent Exceedence Level 100 Percent of Maximum Available Habitat 80 60 40 20 0 Study Site R. Ranch - Fry Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Month Proposed Minimum Flows 50 Percent Exceedence Level When expanding the site-level results to estimate the available habitat for the entire reach, by applying the results of Hardy and Addley’s (2006) aerial photogrammetry image acquisition and digital terrain modeling, the percentage of available habitat significantly increased (Table 3-24). For example, even at minimum flows, the maximum available habitat for juvenile coho salmon for the reach was reached or exceeded throughout the entire year (Figure 3-21 and Appendix 3-D-11). 246
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Biological Assessment The Effects o
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Biological Assessment The Effects o
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Klamath Project Operations Biologic
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EXECUTIVE SUMMARY This biological a
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Part 1 INTRODUCTION, ACTION AREA, A
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Part 2 ENDANGERED SUCKERS Sucker De
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Table 2-7. Upper Klamath Basin Nutr
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Part 3 COHO SALMON Information abou
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Environmental Baseline Klamath Proj
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Page 220 and 221: Klamath Project Operations Biologic
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Part 7 CONSULTATION HISTORY Section
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Part 9 LITERATURE CITED Agrawal, A.
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Accomplishment Report, Winter 2007.
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