WSP12673

• File Number: 8282.300
• Description: Colorado River Operations and Accounting - Lower Basin Administrative Procedures
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/16/1997
• Author: US FWS
• Title: FWS Final Biological and Conference Opinion on Lower Colorado River Operations and Maintenance - Lake Mead to Southerly International Border - 05-16-97
• Water Supply Pro - Doc Type: Report/Study

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BIOLOGICAL OPINION

Tabl e of Con ten ts

Effects of the Environmental Baseline. . . . . . . . . . . . . . . . . . . . . . .. 127
Effects of the Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 137
Cumulative Effects: Bony tail Chub and Razorback Sucker . . . . . . . . . " 139
Cumulative effects of human population growth . . . . . . . . . . . .. 139
Cumulative effects of economic development . . . . . . . . . . . . . " 139
Cumulative effects of future visitation/recreation ............ 139
Cumulative effects of environmental contaminants ........... 139
Cumulative effects of non-Federally supported
stocking of non-native fish . . . . . . . . . . . . . . . . . . . . .. 140
Southwestern Willow Flycatcher ................................ 140
Cumulative Effects: Southwestern Willow Flycatcher . . . . . . . . . . . . .. 146
Cumulative effects of human population growth . . . . . . . . . . . .. 146
Cumulative effects of economic development . . . . . . . . . . . . . .. 146
Cumulative effects of future visitation/recreation ............ 146
Cumulative effects of environmental contaminants ........... 146
Cumulative effects of wildfIres. . . . . . . . . . . . . . . . . . . . . . .. 147
Yuma Clapper Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 147
Cumulative Effects: Yuma Clapper Rail. . . . . . . . . . . . . . . . . . . . . .. 147
Cumulative effects of human population growth . . . . . . . . . . . .. 147
Cumulative effects of economic development . . . . . . . . . . . . . .. 148
Cumulative effects of future visitation/recreation ............ 148
Cumulative effects of environmental contaminants ........... 148
Cuinulative effects of wildfires . . . . . . . . . . . . . . . . . . . . . . .. 148
Flat-tailed Horned Lizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 148
Mortality and Injury of Flat-tailed Horned Lizards
During Operation, and Maintenance of the Roads
and Ancillary Facilities. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 148
Cumulative Effects: Flat-tailed Horned Lizard. . . . . . . . . . . . . . . . . .. 150

SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 150

Bony tail Chub and Razorback Sucker . . . . . . . . . . . . . . . . . . . . . . . . . . . " 150
Southwestern Willow Flycatcher ................................ 151
Yuma Clapper Rail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 151
Flat-tailed Horned Lizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 151

CONCLUSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 152
Bony tail Chub and Razorback Sucker ... . . . . . . . . . . . . . . . . . . . . . . . . " 152
Basis for the Analyses .................................. 152
Bony tail Chub ....................................... 153
Razorback Sucker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 153
Critical Habitat ...................................... 154
Southwestern Willow Flycatcher ................................ 155
Yuma Clapper Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 155