Mitigation for the Construction and Operation of Libby Dam

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Table A1. Therriault Creek depletion population estimates for fish > 75 mm per 1,000 feet using 95 % confidence intervals. Upper confidence intervals are in parenthesis. Year 1997 1998 1999 2000B 2001 2002 2003 Section 1 Rainbow Trout 123 (260.84) 130 (150.91) 82 (89.15) ----- ----- ----- 56 (57) Brook Trout 41 (46.52) 49 (56.27) 60 (63.67) ----- ----- ----- 59 (66) Total Population A 149 (213.70) 182 (206.89) 141 (149.12) ----- ----- ----- Section 2 Rainbow Trout 36 (41.36) 79 (81.62) 76 (83.34) ----- 93 (101.99) ----- 84 (n/a) Brook Trout 56 (57.53) 125 (136.96) 72 (80.47) ----- 82 (87.34) ----- 58 (61) Bull Trout 47 (48.87) 15 (16.42) 3 ----- 2 ----- 40 (42) A Total Population 92 (95.90) 205 (216.88) 149 (162.50) ----- 180 (192.55) ----- Section 3 Rainbow Trout 54 (58.1) 164 (169.82) 177 (205.30) ----- ----- 99 (104) Brook Trout 74 (76.7) 82 (87.79) 110 (116.71) ----- ----- 67 (72) Bull Trout 0 0 0 10 (n/a) Total Population A 66 (92.68) 248 (256.53) 284 (307.71) ----- ----- A) Includes rainbow, rainbow x cutthroat hybrids, and brook trout. Bull trout were not included in the total population estimate. B) Therriault Creek was not sampled during the 2000 or 2002 field seasons. 149
Table A2. Lower Grave Creek Demonstration Project area electrofishing. Numbers are total catch within the 1,000 foot section. Year 2000 A 2001 B 2002 C 2003 Westslope Cutthroat 4 18 3 13 (n/a) Rainbow Trout 1 17 26 24.5 (28.7) Brook Trout 1 10 5 8.5 (18.2) Bull Trout 9 33 5 40.5 (144.4) Mountain Whitefish 54 3 33 21 (21.4) Long Nose Dace 6 ----- ----- ----- Water Temp. 0 C ----- 17 ----- ----- Effort (minutes) 44 56.9 NA NA A) Four bull trout > 490 mm were likely lacustrine - adfluvial fish from Libby Reservoir moving into Grave Creek to spawn. Three bull trout < 75 mm were also included in the total. B) Four bull trout > 470 mm were likely lacustrine - adfluvial fish from Libby Reservoir moving into Grave Creek to spawn. Long nose dace were observed but not counted in 2001. C) Due to the presence of approximately 2,000 mature kokanee, the section was snorkeled rather than electrofished. Two adult bull trout were observed that were likely lacustrine - adfluvial fish from Libby Reservoir moving into Grave Creek to spawn. Long nose dace were observed but not counted. 150
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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
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Chapter 1 Physical and Biological M
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Biological monitoring data was prov
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Figure 1. An aerial photograph of L
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antenna located approximately 5 cm
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We compared samples collected in Se
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extends downstream 131 m. This sect
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and reduced again to 28 ganged floa
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Results Bull Trout Redd Counts Grav
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Table 1. Bull trout redd survey sum
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Quartz Creek Bull trout redd counts
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Bull Trout Redds 40 35 30 25 20 15
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Keeler Creek Bull trout that spawn
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Burbot Monitoring Below Libby Dam T
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Table 2. Summary information for th
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7000 6000 5000 Y = 45.246e 0.0055x
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The Libby FWP Mitigation Staff surg
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Table 2. (Continued) Capture locati
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Figure 18. Capture locations for a
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Table 4. T-test results. This table
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Figure 19. Montana Mountain Metrics
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Table 5. T-test results. This table
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Juvenile Salmonid Population Estima
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Grave Creek Juvenile salmonid monit
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Number Fish per 1000 Feet 100 80 60
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Libby Creek Section 1 of Libby Cree
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Figure 28. Rainbow trout, brook tro
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Pipe Creek Juvenile rainbow trout w
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Table 6. Average length and weight
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Catch per Net A. Mountain Whitefish
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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
Page 135 and 136: educed the mean width and width to
Page 137 and 138: Table 7. Mean cross sectional area,
Page 139 and 140: Discussion The Grave Creek Phase I
Page 141 and 142: References Chisholm, I.M., M.E. Hen
Page 143: Appendix 148
Page 147 and 148: Table A4. Libby Creek depletion pop
Page 149 and 150: Table A7. Mean zooplankton densitie
Page 151 and 152: Table A9. Mean zooplankton densitie
Page 153: Table A13. Yearly mean total zoopla
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Mitigation for the Construction and Operation of Libby Dam

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