Mitigation for the Construction and Operation of Libby Dam

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Kootenai River Adult Bull Trout Population Estimate We marked a total of 109 bull trout on April 8 and 15, 2004 below Libby Dam, and captured a total of 116 bull trout during the recapture runs, of which 13 bull trout were marked. We estimated an overall capture efficiency of 12%. The average bull trout total length was 649 mm (range = 343 – 861 mm; Figure 10). We estimated a total of 920 bull trout in the Kootenai Dam from Libby Dam downstream to the Fisher River confluence. The 95% confidence interval ranged from 698 – 1142 bull trout. We standardized the population estimate and 95% confidence interval into fish per mile, for a total of 263 bull trout per mile (95% confidence interval = 199-326). 0. 12 Percent 0.1 0. 08 0. 06 0. 04 Mean = 649 Range = 343 - 861 0. 02 0 300 350 400 450 500 550 600 650 700 750 800 850 Total Length (mm) Figure 10. Length frequency distribution for bull trout captured via jet boat electrofishing on April 8 – 22, 2004 below Libby Dam. 61
Burbot Monitoring Below Libby Dam The burbot catch in our hoop traps below Libby Dam has declined precipitously since 1996/1997 (Figure 12). A total of 3 burbot were captured during the 03/04 trapping season, which represented the lowest total catch and catch per effort (0.031 burbot per trap day) on record since trapping began in the 94-95 trapping season. The most numerous captures occurred in 1995-96 and 1996-97; these years correspond with higher than normal snow-pack, and perhaps greater reservoir drafting. The mean annual catch rate since the 1995/1996 trapping season was 0.668 burbot per trap day. However, the catch rates since then have significantly decreased (r 2 = 0.742; p = 0.003; Figure 12). This relationship was further improved using an exponential fit (r 2 = 0.930; p < 0.001; Figure 12). 3 Fish/Trap Day 2.5 2 1.5 1 0.5 0 Linear All Years r 2 = 0.376; p = 0.06 Exponetial; 96-04 y = 6.8193e-0.6864x r 2 = 0.9303; p < 0.001 94-95 95-96 96-97 97-98 98-99 99-00 00-01 01-02 02-03 03-04 Trap Year Linear 96-04 r 2 = 0.742; p = 0.003 Figure 12. Total catch per effort (burbot per trap day) of baited hoop traps in the stilling basin downstream of Libby Dam 1994/1995 through 2003/2004. The data were fit with linear regression for all years (1994/1995 – 2003/2004), 1995/1996 – 2003/2004 and with an exponential model for 1995/1996 – 2003/2004. The traps are baited with kokanee salmon and fished during December and February. 62
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Mitigation for the Construction and
Page 3 and 4:
MITIGATION FOR THE CONSTRUCTION AND
Page 5 and 6: depth of burbot that were relocated
Page 7 and 8: ACKNOWLEDGEMENTS We are thankful to
Page 9 and 10: Juvenile Salmonid Population Estima
Page 11 and 12: deviation from reference conditions
Page 13 and 14: Figure 46. Minimal detectible diffe
Page 15 and 16: Chapter 2 Tables Table 1. Design sp
Page 17 and 18: INTRODUCTION Libby Reservoir was cr
Page 19 and 20: PROJECT HISTORY Montana Fish, Wildl
Page 21 and 22: 2002 - Montana FWP collaborated wit
Page 23 and 24: 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: Keeler Creek Bull trout that spawn
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 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
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We believe that Libby Reservoir dur
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Figure 47. Minimal detectible diffe
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References Bahls, L., R. Bukantis,
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trout status report (below Kootenai
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Chapter 2 Stream Restoration and Mi
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food sources, as evidenced by the l
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Methods and Results Eureka Pond The
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spacing was 172.8 feet, which repre
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Figure 2. Vicinity Map for Upper Li
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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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