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Table of Contents INTRODUCTION .............................................................................................................. 1 Objectives .................................................................................................................... ... 2 Study area ..................................................................................................................... ... 2 METHODS ...................................................................................................................... ... 9 IFIM Site Selection ...................................................................................................... ... 9 Fryingpan River ....................................................................................................... ... 9 Roaring Fork River .................................................................................................. . 12 IFIM Data Collection ................................................................................................... . 13 Hydraulic Simulations ................................................................................................. . 14 Macroinvertebrates ...................................................................................................... . 17 Spawning ...................................................................................................................... . 19 Trout Populations ......................................................................................................... . 23 Thermal Regime ........................................................................................................... . 23 Habitat Mapping .......................................................................................................... . 24 RESULTS ........................................................................................................................ . 26 IFIM Hydraulic Modeling ............................................................................................ . 26 Macroinvertebrates ...................................................................................................... . 42 Spawning ...................................................................................................................... . 51 Trout Populations ......................................................................................................... . 56 Thermal Regime ........................................................................................................... . 63 Hydrology .................................................................................................................... . 67 Habitat Mapping .......................................................................................................... . 68 DISCUSSION .................................................................................................................. . 70 IFIM ............................................................................................................................. . 70 Macroinvertebrates ...................................................................................................... . 71 Influence of Ruedi Dam ........................................................................................... . 74 Mysis relicta ............................................................................................................. . 77 Flow alterations ........................................................................................................ . 78 Thermal Regime ........................................................................................................... . 80 Spawning ...................................................................................................................... . 82 Dissolved oxygen ..................................................................................................... . 83 Substrate Size ........................................................................................................... . 84 CONCLUSIONS .............................................................................................................. . 88 MEC Study Conclusions .............................................................................................. . 91 Management Recommendations .............................................................................. . 92 ACKNOWLEDGEMENTS ............................................................................................. . 93 LITERATURE CITED .................................................................................................... . 94 APPENDIX A - Photo Documentation of IFIM Site Characteristics at Different Flows ......................................................................................................................................... 102 APPENDIX B - Invertebrate Data .................................................................................. 103 APPENDIX C - Habitat Mapping Data .......................................................................... 104 Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003 Miller Ecological Consultants, Inc. 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