Mitigation for the Construction and Operation of Libby Dam

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Young Creek Section 5 was the only section of Young Creek sampled in 2003, and lies entirely within the stream restoration project completed on State land in the fall of 2003. Therefore, all data collected through 2003 represents data gathered prior to the restoration project completion. Cutthroat trout and brook trout have exhibited a stable population trends in Section 5 of Young Creek since 1998, with annual mean abundance estimates of 199.5 cutthroat trout per 1000 feet and 39.8 brook trout per 1000 feet (Figure 25; Table A3). Abundance estimates for cutthroat trout have ranged from 126 fish per 1000 feet in 2000 to 268 fish per 1000 feet in 2002. Brook trout abundance was also variable, ranging from 19 to 62 fish per 1000 feet (Figure 25). These data presented here will be used in future years to evaluate the fish community response to the restoration project during the fall of 2003. Number Fish per 1000 Feet 300 250 200 150 100 50 0 1998 1999 2000 2001 2002 2003 Years Cutthroat Trout Brook Trout Figure 25. Cutthroat trout and brook trout densities (fish per 1000 feet) within the Young Creek Section 5 monitoring site from 1997-2003 collected by performing backpack electrofishing. Upper 95% confidence intervals are represented by the whisker bars. 85
Libby Creek Section 1 of Libby Creek has been sampled each consecutive year since 1998, and although the Libby Creek Demonstration Restoration Project was completed in the fall of 2001. Fish monitoring data collected from 1998 to 2001 represents the fish community prior to project implementation. Electrofishing conducted in 1999 and 2000 were limited to single pass catch estimates. Although mean rainbow trout densities at this site were higher for the two years following the restoration project implementation (100.5 fish per 1,000 feet) compared to the four years prior to implementation (69.5 fish per 1,000 feet), the differences were not significant (p = 0.207). Similarly, mean brook trout abundance at this site before and after project completion were slightly higher after project completion (8.8 and 10.5 fish per 1,000 feet, respectively; Figure 26), but the differences were not significant (p = 0.350). Juvenile bull trout were only observed in this section in 2002, with an estimated abundance of 3 fish per 1000 feet. There is no apparent temporal trend in rainbow trout (r 2 = 0.08; p = 0.58) or brook trout abundance (r 2 = 0.07; p = 0.61) within this section (Figure 27; Table A4). Section 2 of Libby Creek was sampled in 1998, 2001 and 2003 (Table A4). Rainbow trout were substantially more abundant at this section than brook trout and bull trout during all years (Figure 28). We estimated 203, 148 and 100 rainbow trout per 1000 feet in 1998 through 2003, respectively. There was a significant negative trend in rainbow trout abundance through time at this site (r 2 = 0.994; p = 0.048). Bull trout were observed in this section in 1998 and 2003 (Figure 28; Table A4). Our estimates of rainbow trout abundance in Section 3 of Libby Creek were similar between 2000 and 2002 (Figure 29; Table A4), with no evidence that the population differed from a stable population (p = 0.469; r 2 = 0.548) during this period, which represents conditions at this site prior to the upper Cleveland’s Stream Restoration Project was completed. However, the rainbow trout estimate we conducted in 2003 was substantially lower than previous years (mean abundance 112.3 and 168.3 fish per 1,000 feet, respectively). We did not perform any statistical analyses to evaluate fish response before and after project completion due to lack of replication after completion. No brook trout were observed at this site. Estimates of juvenile bull trout abundance at this site ranged from 3 to 10.8 fish per 1000 feet over the four years (Figure 29). 86
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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
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 and 76: Juvenile Salmonid Population Estima
Page 77 and 78: Grave Creek Juvenile salmonid monit
Page 79: Number Fish per 1000 Feet 100 80 60
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
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
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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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