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Final Report September 2000 4.3.6 Summary of Seasonal Flow-Habitat Relationships for Razorback Suckers in the Green River System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-68 4.3.6.1 Spring............................................. 4-68 4.3.6.2 Summer and Autumn ................................. 4-70 4.3.6.3 Winter............................................. 4-72 4.4 Humpback Chub .................................................. 4-76 4.4.1 Distribution and Status Overview ............................... 4-76 4.4.2 Life History Overview ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-78 4.4.3 Research on Humpback Chub for the 1992. Flaming Gorge Biological Opinion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-79 4.4.4 Research on Humpback Chub for the 19901-1996 Flaming Gorge Flow Recommendations Investigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-79 4.4.5 Other Recent Research on Humpback Chub ....................... 4-80 4.4.6 Ecology of Humpback Chub in the Green River System. . . . . . . . . . . . . . 4-80 4.4.6.1 Distribution and Abundance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-80 4.4.6.2 Life History by Season ................................ 4-83 4.4.7 Summary of Seasonal Flow-Habitat Relationships for Humpback Chub in the Green Ri vel' System ................................ 4-93 4.4.7.1 Spring............................................. 4-93 4.4.7.2 Summer and Autumn ................................. 4-94 4.4.7.3 Winter............................................. 4-94 5 FLOW AND TEMPERATURE RECOMMENDATIONS .......................5-1 5.1 Summary of Species Flow and Temperature Needs ........................ 5-1 5.2 Recommendations and Implementation Approach ......................... 5-5 5.2.1 Recommendations for Reach 1 - Flaming Gorge Dam to the Yampa River Confluence. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 5-10 5.2.2 Recommendations for Reach 2 - Yampa River Confluence to the White River Confluence .........,........................ 5-13 5.2.3 Recommendations for Reach 3 - White River Confluence to the Colorado River Confluence. . . . . . " . . . . . . . . . . . . . . . . . . . . . . . . 5-20 5.3 Examples of Recommended Flow Patterns in Representative Years .......... 5-24 5.4 Comparison of Flow and Temperature Recommendations with the 1992 Biological Opinion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34 5.5 Uncertainties ..................................................... 5-37 5.6 Research and Monitoring Needs ...................................... 5-39 6 REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 APPENDIX A: SUPPORTING INFORMATION ON HYDROLOGY OF THE GREEN RIVER SYSTEM ................................................... A-I A.l Hydrologic Conditions in the Upper Green River and Yampa River Basins during 1990-1996 ................................................. A-I A.2 Operations of Flaming Gorge Dam during 1990-1996 ..... . . . . . . . . . . . . . . .. A-3 A.2.1 Operations during Water Year 1990 ............................. A-3 IX