Mitigation for the Construction and Operation of Libby Dam

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Pipe Creek Bull trout redd counts in Pipe Creek peaked in 1999 with 36 redds, with redd numbers and have decreased since that peak. Despite the decreasing trend of bull trout redds during the last four years, the overall general trend during the time period 1995-2003 has been variable, with a slope that is not significantly different than a stable population (Figure 5; r 2 = 0.149; p = 0.173). The mean number of bull trout redds since 1990 has been 15 redds. The 10 redds we observed in Pipe Creek in 2003 was 33.3% lower than the 13 year average. Low water conditions during the fall spawning season during the past three years may partially explain the low spawner escapement into Pipe Creek. Bear Creek Bear Creek bull trout redd counts have been variable during the period 1995-2003 (Figure 6; r 2 = 0.03). Although the overall general trend has increased since 1995, the relationship is not statistically different than a stable population (Figure 6; p = 0.668). Low water conditions in Bear Creek during the past three years also partially explain the low spawner escapement in Bear Creek. The average number of bull trout redds since 1995 in Bear Creek has been 16.1 redds. The 14 redds we observed in Bear Creek in 2003 was 13.1% less than the 8 year average. O’Brien Creek The general trend of bull trout redds in O’Brien Creek is generally increasing since 1995 (Figure 7; r 2 = 0.592; p = 0.002). We observed a total of 46 bull trout redds in O’Brien Creek in 2003 (Table 1). West Fisher River We were unable to determine a significant trend in bull trout redds in the West Fisher River over the period of record for this stream (1993-2003). From the period 1993-2000, the general trend was one of increasing abundance. However, we observed only 1 bull trout redd in each of the previous three years (Figure 8). The overall trend was not significantly different than a stable (zero slope) population (r2 = 0.036; p = 0.578). Given the amount of variation present within this dataset, the overall mean number of redds in the West Fisher (mean = 5.6 redds) does an equally good job at predicting redd numbers. Drought conditions during the previous 3 summers/late fall periods may have contributed to the lower bull trout spawner escapement into the West Fisher River. 57
Bull Trout Redds 40 35 30 25 20 15 10 1990-2003 r 2 = 0.149 p = 0.173 Y = -2100.0 + 1.06*X 1990-2003 Mean =15 5 0 1985 1990 1995 2000 2005 Year Figure 5. Bull trout redd counts and trend analysis (blue line) for Pipe Creek 1990-2003. Bull Trout Redds 40 35 30 25 20 15 10 5 0 1995-2003 r 2 = 0.028 p = 0.668 Y = -1183.3 + 0.6*X 1995-200301 Mean = 16.1 1994 1996 1998 2000 2002 2004 Year Figure 6. Bull trout redd counts and trend analysis (blue line) in Bear Creek, a tributary to Libby Creek, 1995-2003. The mean number of bull trout redds was 16.1. 58
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: Quartz Creek Bull trout redd counts
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 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 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 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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