Mitigation for the Construction and Operation of Libby Dam

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Bull Trout Redds 60 50 40 30 20 10 1991-2003 r 2 = 0.592 p = 0.002 Y = -5906.3 + 2.97*X 0 1990 1992 1994 1996 1998 2000 2002 2004 Year Figure 7. Bull trout redd counts and trend line (blue line) in O’Brien Creek 1991-2003. 25 Bull Trout Redds 20 15 10 5 1993-2003 r 2 = 0.036 p = 0.578 Mean = 5.5 0 1992 1994 1996 1998 2000 2002 2004 Year Figure 8. Bull trout redd counts in the West Fisher River, a tributary to the Fisher River, 1993-2003. 59
Keeler Creek Bull trout that spawn in Keeler Creek (including the North, South and West Forks) are an adfluvial stock, that migrate downstream out of Bull Lake into Lake Creek, then up Keeler Creek. This downstream spawning migration is somewhat unique when compared to other bull trout populations (Montana Bull Trout Scientific Group 1996). Lake Creek, a tributary of the Kootenai River, has an upstream waterfall barrier isolating this population from the mainstem Kootenai River population. A micro-hydropower dam constructed in 1916 covered the upper portion of the waterfall. A series of high gradient waterfalls are still present below the dam, and are barriers to all upstream fish passage. Keeler Creek may supply some recruitment to the Kootenai River through downstream migration. We observed a total of 87 bull trout redds in Keeler Creek and associated tributaries in 2003 (Table 1). A beaver dam located in lower Keeler Creek during late summer/early fall 2001 likely impeded upstream bull trout migration. The dam was removed, but stream flow increased substantially after the dam was removed and prevented counts from being made after removal of the dam. Therefore, the 13 redds observed in 2001 is an underestimate of the true number of redds in Keeler Creek in 2001. With the 2001 observation included, annual variation is high (r 2 = 0.004; Figure 9), although the trend is an increasing population trend, although the relationship is not significantly different from a stable population (Figure 9; p = 0.889). Given this relationship, the annual mean (77 redds) does an equally good job of prediction. The 2003 observation represents a 13% increase relative to the annual mean. However, if we remove the 2001 observation from the dataset and repeat the regression trend analysis, bull trout redds in Keeler Creek show a nearly significant increasing trend since 1996 (Figure 9; r 2 = 0.366; p = 0.150). 120 Bull Trout Redds 100 80 60 40 20 1996-2003 r 2 = 0.0036 p = 0.889 Y = -1351.2 - 0.714*X 2001 Excluded r 2 = 0.366 p = 0.150 Y = -6998.3 + 3.54*X 0 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Year Figure 9. Bull trout redd counts and trend line (blue line) in Keeler Creek, a tributary to Lake Creek, 1996-2003. A beaver dam was present in lower Keeler Creek in the fall of 2001 that likely impeded bull trout migration. Therefore the 2001 observation was removed and the regression analysis was repeated (orange line). 60
Page 1 and 2:
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: Bull Trout Redds 40 35 30 25 20 15
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 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
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Chapter 2 Stream Restoration and Mi
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food sources, as evidenced by the l
Page 119 and 120:
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
Page 131 and 132:
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
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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