Mitigation for the Construction and Operation of Libby Dam

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Parmenter Creek Juvenile salmonid abundance estimates conducted in 2000 represent pre-project estimates, while the surveys conducted in 2001 and 2003 represent estimates after the restoration efforts on lower Parmenter Creek were completed. We did not survey Parmenter Creek in 2002. Rainbow trout were the most abundant fish species observed in Parmenter Creek during all years of sampling (2000, 2001 and 2003; Figure 30), with estimates of 92 and 79 fish per 1000 feet, respectively (Table A5). Statistical analysis was not performed to compare abundances before and after the stream channel restoration work due to lack of replication. However, the overlapping 95% confidence intervals for rainbow trout estimates between years suggests differences were not likely significant. Brook trout were more abundant in 2000 than 2001 at this site (Figure 30). We did not observe any juvenile bull trout at this site in 2000, but did observe bull trout at this location in 2001, with an estimated abundance of 1 fish per 1000 feet (Table A5). Number Fish per 1000 Feet 140 120 100 80 60 40 20 0 2000 (Pre) 2001 + 2003 (Post) Year Rainbow Trout Brook Trout Bull Trout Cutthroat Trout Figure 30. Cutthroat trout, bull trout and brook trout densities (fish per 1000 feet) within the Parmenter Creek monitoring site collected by performing backpack electrofishing. Fish abundance estimates from 2000 represent pre-project information, and surveys conducted in 2001 represent post-project data. Upper 95% confidence intervals are represented by the whisker bars. The site was not sampled in 2002. 89
Pipe Creek Juvenile rainbow trout were more abundant at the lower Pipe Creek Section in 2002 than 2001 and 2003 (Table A6), with estimates of 73 fish per 1000 feet in 2002 and 46 and 43 fish per 1000 feet in 2001 and 2003, respectively (Figure 31). Brook trout abundance increased slightly through time, with 0, 3, and 6.5 brook trout per 1,000 feet estimated from 2001 through 2003. We did not capture any mountain whitefish in either 2001 or 2002, but did capture sufficient numbers in 2003 to produce a population estimate for this site of 8.7 mountain whitefish per 1,000 feet. Number Fish per 1000 Feet 80 60 40 20 0 2001 2002 2003 Year Rainbow Trout Brook Trout Figure 31. Cutthroat trout and brook trout densities (fish per 1000 feet) within the Pipe Creek monitoring site during 2000, 2001 and 2003 collected by performing backpack electrofishing. Upper 95% confidence intervals are represented by the whisker bars. The site was not sampled in 2002. 90
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Mitigation for the Construction and
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MITIGATION FOR THE CONSTRUCTION AND
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depth of burbot that were relocated
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ACKNOWLEDGEMENTS We are thankful to
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Juvenile Salmonid Population Estima
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deviation from reference conditions
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Figure 46. Minimal detectible diffe
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Chapter 2 Tables Table 1. Design sp
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INTRODUCTION Libby Reservoir was cr
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PROJECT HISTORY Montana Fish, Wildl
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2002 - Montana FWP collaborated wit
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DESCRIPTION OF STUDY AREA Subbasin
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Table 1. Current relative abundance
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Similar impacts have been observed
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2460 2440 2420 2400 2380 2360 2340
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construction and operation of Libby
Page 33 and 34: Chapter 1 Physical and Biological M
Page 35 and 36: Biological monitoring data was prov
Page 37 and 38: Figure 1. An aerial photograph of L
Page 39 and 40: antenna located approximately 5 cm
Page 41 and 42: We compared samples collected in Se
Page 43 and 44: extends downstream 131 m. This sect
Page 45 and 46: and reduced again to 28 ganged floa
Page 47 and 48: Results Bull Trout Redd Counts Grav
Page 49 and 50: Table 1. Bull trout redd survey sum
Page 51 and 52: Quartz Creek Bull trout redd counts
Page 53 and 54: Bull Trout Redds 40 35 30 25 20 15
Page 55 and 56: Keeler Creek Bull trout that spawn
Page 57 and 58: Burbot Monitoring Below Libby Dam T
Page 59 and 60: Table 2. Summary information for th
Page 61 and 62: 7000 6000 5000 Y = 45.246e 0.0055x
Page 63 and 64: The Libby FWP Mitigation Staff surg
Page 65 and 66: Table 2. (Continued) Capture locati
Page 67 and 68: Figure 18. Capture locations for a
Page 69 and 70: Table 4. T-test results. This table
Page 71 and 72: Figure 19. Montana Mountain Metrics
Page 73 and 74: Table 5. T-test results. This table
Page 75 and 76: Juvenile Salmonid Population Estima
Page 77 and 78: Grave Creek Juvenile salmonid monit
Page 79 and 80: Number Fish per 1000 Feet 100 80 60
Page 81 and 82: Libby Creek Section 1 of Libby Cree
Page 83: Figure 28. Rainbow trout, brook tro
Page 87 and 88: Table 6. Average length and weight
Page 89 and 90: Catch per Net A. Mountain Whitefish
Page 91 and 92: Table 8. Kamloops rainbow trout cap
Page 93 and 94: 25000.0 20000.0 15000.0 10000.0 500
Page 95 and 96: Burbot per Trap Day 3 2.5 2 1.5 1 0
Page 97 and 98: Table 9. Average catch per net for
Page 99 and 100: Table 11. Percent composition of ma
Page 101 and 102: deviation = 0.052; Figure 43), with
Page 103 and 104: Table 12. Individual probability va
Page 105 and 106: Discussion Long-term monitoring of
Page 107 and 108: We believe that Libby Reservoir dur
Page 109 and 110: Figure 47. Minimal detectible diffe
Page 111 and 112: References Bahls, L., R. Bukantis,
Page 113 and 114: trout status report (below Kootenai
Page 115 and 116: Chapter 2 Stream Restoration and Mi
Page 117 and 118: food sources, as evidenced by the l
Page 119 and 120: Methods and Results Eureka Pond The
Page 121 and 122: spacing was 172.8 feet, which repre
Page 123 and 124: Figure 2. Vicinity Map for Upper Li
Page 125 and 126: Table 1. Design specifications for
Page 127 and 128: 70 60 50 40 30 20 10 0 500 1000 150
Page 129 and 130: Grave Creek Phase I Restoration Pro
Page 131 and 132: Table 4. Design specifications for
Page 133 and 134: 190.0 185.0 180.0 175.0 170.0 165.0
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educed the mean width and width to
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Table 7. Mean cross sectional area,
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Discussion The Grave Creek Phase I
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References Chisholm, I.M., M.E. Hen
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Appendix 148
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Table A2. Lower Grave Creek Demonst
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Table A4. Libby Creek depletion pop
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Table A7. Mean zooplankton densitie
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Table A9. Mean zooplankton densitie
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Table A13. Yearly mean total zoopla
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Mitigation for the Construction and Operation of Libby Dam

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