Draft EIS_072312.pdf - Middle Fork American River Project ...

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 Fork Long Canyon upstream of the diversions. Rainbow trout eggs hatch and emerge in 5 to 7 weeks (at 10 to 15°C). The fry observation dates coupled with the water temperature data collected suggest that rainbow trout spawning occurred approximately in April and May in Duncan Creek, North Fork Long Canyon Creek, and South Fork Long Canyon Creeks. Rainbow trout in Gas Canyon Creek likely spawned in March. In 2009, YOY rainbow trout were first observed upstream of the small diversion structures on June 23 in North Fork Long Canyon Creek and about 2 weeks later (July 6) in Duncan Creek and South Fork Long Canyon Creek. Estimated spawning dates were developed using measured water temperature and back calculating 630 degree-days (i.e., time within the gravel before emerging). In Duncan Creek, North Fork Long Canyon Creek, and South Fork Long Canyon Creek the estimated spawning dates in 2009 were May 3, April 23, and May 11, respectively. Small Sacramento pikeminnow (0.9 to 1.1 inches) were captured in the Middle Fork American and Rubicon Rivers upstream of Ralston afterbay in the early June sampling (June 5 through 7, 2007). Sacramento pikeminnow likely spawned in April and May consistent with the existing literature (Moyle, 2002). Sacramento sucker were observed actively spawning in the Rubicon River immediately upstream of Ralston afterbay on May 11, 2007. Sacramento sucker YOY were first captured about 2 months later (July 16) in the Middle Fork American River immediately upstream of Ralston afterbay. Fish in Reservoirs and Diversion Pools In French Meadows reservoir, brown trout, rainbow trout, tui chub, and kokanee salmon were captured. Brown trout were common (gill netting catch per unit effort [CPUE] was typically >0.1 fish per net hour). There were fewer rainbow trout (>0.03 fish per net hour). Only one kokanee salmon and one tui chub were caught during surveys. The kokanee was likely an anomaly because no known kokanee stocking has occurred in this reservoir. Most of the rainbow and brown trout captured were between 9 and 20 inches in length, with a few larger fish up to 29 inches. In French Meadows reservoir, primarily rainbow trout have been stocked at an average of 9,906 catchable fish per year (2001 through 2009). Hell Hole reservoir had the greatest fish species diversity of the two reservoirs with six species total, including brown trout, rainbow trout, lake trout, kokanee salmon, tui chub, and Sacramento sucker. Brown trout were common (>0.1 fish per net hour). There were few rainbow trout. Sacramento sucker was the most abundant species in Hell Hole reservoir (>0.5 fish per net hour), and kokanee salmon were common (>0.06 fish per net hour). Most of the rainbow and brown trout captured were between 7 and 22 inches in length. Kokanee salmon ranged from about 12 to 17 inches in length. In Hell Hole reservoir, lake trout were historically stocked and currently are self-sustaining. Currently, kokanee salmon and brown trout are stocked annually. Between 2001 and 94
20120723-4002 FERC PDF (Unofficial) 07/23/2012 2009, an average of 24,566 kokanee fingerlings per year and 5,542 catchable brown trout per year were stocked in Hell Hole reservoir. Gill netting CPUE for all species combined in Ralston afterbay was 0.56 to 0.86 fish per hour. Ralston afterbay contained rainbow trout, brown trout, hardhead, Sacramento sucker, and Sacramento pikeminnow. Sacramento sucker was the most abundant species captured; 77 percent of the fish captured during the combined gill net sampling (including 2007) were large Sacramento sucker (13 to 22 inches). Hardhead constituted 3 percent of the catch. The remainder of the fish captured included rainbow trout (8 percent), brown trout (8 percent) and Sacramento pikeminnow (3 percent). In Middle Fork interbay, only rainbow and brown trout were captured. Abundance was similar for both species. The combined trout gillnet catch was 0.15 fish per hour. In the North and South Fork Long Canyon creek diversion pools, rainbow trout are present, and both rainbow and brown trout are present in the Duncan Creek diversion pool. Very low numbers of fish were observed (
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41 Table 3.3.1-1. Average number of
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145 Table 3.3.3-5. Special-status w
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147 Species Name Status Habitat Occ
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195 Figure 3.3.5-1. French Meadows
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197 Figure 3.3.5-3. Long Canyon, re
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253 Table 3.3.6-1. Archaeological a
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255 Resource Number Type a Descript
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275 Table 4-2. Summary of annual co
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279 Enhancement/Mitigation Measures
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303 c Base 2010 costs were provided
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307 Resource No-Action Alternative
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319 Table 5-2. Staff-recommended mi
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321 Location Middle Fork American R
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