Mitigation for the Construction and Operation of Libby Dam

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Figure 4. The top cross sectional survey of Libby Creek (#12C) was surveyed by Montana FWP in 1999, and is typical representation of the braided channel and large amounts of deposition within the floodplain of the upper Libby Creek Cleveland Project site. The lower figure characterizes the design criteria used to implement project construction activities at this site. 129
Table 1. Design specifications for the upper Libby Creek (Cleveland’s) channel restoration project. Channel Design Range Mean Existing – 1999 (Mean) Design Channel Type (C4) Drainage Area = 12 sq. miles Total Length 3,200 2,700 (braided throughout) Bankfull Width (ft) 28-35 33 28-43 (37) Bankfull Area (ft 2 ) 40-60 47 47-123 Width/Depth Ratio 20-23 21.5 15-35 Sinuosity 1.3 – 1.7 1.6 1.1 – 1.06 (1.1) Band Width (ft) 100 -140 135 135 Radius of Curvature (Rc) (ft) 88-135 106 108-204 (143) Rc/Wbf Ratio* 2.75 – 4.2 3.3 3.3 – 6.3 (4.4) Mean Bankfull Depth (ft) 2.0-2.2 2.1 0.58 – 1.79 (1.18) Max Bankfull Depth (ft) 2.5-3.2 3.0 1.6-3.1 (2.15) Max Scour Depth (ft) 7.0 7.0 Riffle Mean Velocity (fps) 5.0-6.0 5.5 6.5 – 7.0 (6.8) Meander Length (ft) 290-485 369 184 – 900 (481) Pool Spacing (ft) 75 –100’ 80’ 127 –500 (247) Riffle Slope ft/ft (Base Flow) 0.018 – 0.020 0.019 0.011-0.033 (0.019) Pool Slope ft/ft (Base Flow) 0.002 – 0.003 0.0025 0.007-0.003 (0.005) * Rc/Wbf ratio for higher bedload C4 stream types should average 3.0 – 3.5 to effectively transport sediment. 130
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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
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
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: Figure 2. Vicinity Map for Upper Li
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 and 144: Appendix 148
Page 145 and 146: Table A2. Lower Grave Creek Demonst
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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