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Table of Contents EXECUTIVE S~Y............................................... iii LI S T OF TABLE S ................................................... v ... LIST OF FIGURES................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi INTRODUCTION ..... ...... ........ ................... .... .........1 STUDY AREA Description of river strata.................................. 3 Historic hydrology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Flows during the study period. ........ .............. .........7 METHODS Cross section profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hydraulic simulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Definitions of habitat variables............................ 12 sta tistical testing......................................... 13 Inflection point determination. ...... ......... ..............13 Habitat availability........................................ 14 RESULTS Cluster locations.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Riffle locations and testing of variables................... 15 Inflection point analysis................................... 17 Habitat characteristics of inflection point flows........... 20 Physical habitat simulation................................. 24. DISCUSSION Inflection point analysis................................... 29 Colorado squawfish habitat availability (IFIM).............. 30 ACKNOWLEDGEMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 APPENDIX I, STRATA 6, CROSS SECTION DATA......................... 37