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Table of Contents List of keywords......................... ...... ............:........... .................................... ..........................:......................7 Acknowledgements.............. ......................................................................................................................... 7 EXECUTIVE SUMMARy............... ............................................................................................................ 8 CHAPTER 1: BACKGROUND and APPROACH ...................................................................................15 Background......................................................................................................... .................................. .15 Approach........................................................................................................................ ......;............... ..17 CHAPTER 2: HISTORICAL HYDROLOGY AND BIOLOGICAL COMPONENTS OF THE STUDY AREA.......................................................... ................................................................................................ 20 Historic Hydrology............................................................................................................................. .. .20 Description of Study Area and River Strata ............................ ....... ....................................................23 Description ofYampa River Biotic System .........................................................................................26 Native Fishes.. .............................................. ........................... .... ............. ...................... ...................... 29 Colorado oikeminnow...................................................................................................................... . 29 H urn pback chub...................................................................:.......................;............................. .......31 Other native fishes................................................................................................ ..................... ........32 Nonnative Fish.. ........... .............. ................. ...................... ...... ............................. ....... ............ .......... ...36 CHAPTER 3: HABITAT AVAILABILITY AND HYDRAULIC SIMULATION ...................................39 Introduction.................................................... ........................................................................................3 9 Methods ........................................................................................................................................... ...... .40 Cross Section Profiles....................................................................................................................... ...40 Hydraulic Simulation..... .................................... .................. ................................ ........... ............ ......... 42 Curve Break Analysis ................ ......................... ............................................. ...................... ... ............ 43 Physical Habitat Simulation......... ...................................... .......... ..... ........................... ................. ..... 44 Passage....................................................................................................................... .........................44 Statistical Testing................................................................................................................................ 44 Results....................................................................................................................... ............................. .45 Flows During the Study Period... ........ ............ ...................... ....... ..... .......................................... .........45 Cross Section Analysis..................... ......................................... ........................... ............................... 45 Curve Break Analysis...................... .............................................................................................. .......47 Habitat Availability ....................... ........................................... ................... ........ ........................ ... ....55 Colorado pikeminnow diurnal WUA ........................... ........................................... ............ .............5 5 Coloradopikeminnow nocturnal WUA............................................................................................5 5 Humpback Chub Habitat A vailabilitv ... ........................ ......... .................. ...... ........ ............ ........ ..... 56 Passage .............................................................................................................................. ................. 56 Discussion ............................................................................................................................... ................56 Cross Section Analysis......... ....... .............................................................. ....... .................................... 57 Curve Break Points....................................................................... ................. ............................... ....... 57 Habitat Availability..................................................................................................................... ......... 59 Passage .............................................................................................................................. .................60 CHAPTER 4: HABITAT USE... ...... .... ......... .............. ............ ...... .................. ........... ............................. ...61 Introd uction.............................................................................................................................. ..............61 3