Mitigation for the Construction and Operation of Libby Dam

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Number Fish per 1000 Feet 140 120 100 80 60 40 20 0 1997 1998 1999 2000 2001 2002 2003 Year Rainbow Trout Brook Trout Bull Trout Figure 21. Cutthroat trout, bull trout and brook trout densities (fish per 1000 feet) within the Therriault Creek Section 2 monitoring site from 1997-1999, 2001 and 2003 collected by performing backpack electrofishing. Upper 95% confidence intervals are represented by the whisker bars. Number Fish per 1000 Feet 200 150 100 50 0 1997 1998 1999 2000 2001 2002 2003 Year Rainbow Trout Brook Trout Bull Trout Figure 22. Cutthroat trout, bull trout and brook trout densities (fish per 1000 feet) within the Therriault Creek Section 3 monitoring site from 1997-1999 and 2003 collected by performing backpack electrofishing. Upper 95% confidence intervals are represented by the whisker bars. 81
Grave Creek Juvenile salmonid monitoring within the Grave Creek Demonstration Project had two primary objectives, to determine fish population trends through time and to evaluate the fish community response to the restoration activities completed during the fall of 2001 (Grave Creek Demonstration Project). Cutthroat and Rainbow trout were the two combined most abundant fish species present at this site in all years except 2003, when juvenile bull trout were the most abundant species present (Table A2). We compared mean fish abundance (by species) for pre (2000-2001) and post (2002 and 2003) restoration projects using t-tests (Figure 23). However, the variability in pre and post project fish abundance estimates is high (Figure 23 and 24), and sampling methodology differed between years. These factors reduced our ability to distinguish statistical differences in abundance before and after project completion. Brook trout and bull trout abundance increased after at this site after project completion, although the differences were not significant (Figure 23). Rainbow trout abundance at this site did significantly increase from 9.0 to 24.5 fish per 1,000 feet after project completion (p = 0.099). Mean westslope cutthroat trout abundance decreased slightly, although not significantly (p = 0.38; Figure 23). We used linear regression to assess whether there was a temporal trend in abundance for the four fish species at this site (Figure 24). Although the r 2 values for the regression analyses for rainbow, brook and bull trout all exceeded 0.50, none of the trends differed significantly from a zero slope (p > 0.1; Figure 24). There was no apparent trend in westslope cutthroat trout abundance over the period 2000-2003 (Figure 24). 82
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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
Page 25 and 26: Table 1. Current relative abundance
Page 27 and 28: Similar impacts have been observed
Page 29 and 30: 2460 2440 2420 2400 2380 2360 2340
Page 31 and 32: 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: Juvenile Salmonid Population Estima
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 and 84: Figure 28. Rainbow trout, brook tro
Page 85 and 86: Pipe Creek Juvenile rainbow trout w
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
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70 60 50 40 30 20 10 0 500 1000 150
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Grave Creek Phase I Restoration Pro
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Table 4. Design specifications for
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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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