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., ~-- ) ,c--o~ TABLE OF CONTENTS [1 ..l ;-~ t.:.o' ~ ..:;..t APPROVAL PAGE... .....,............,............... .......... ........ .................................................................. ii LIST OFT ABLES.........,.............,............... .............. ...................... ................,............... ................iv LIST OF FIGU"RES ............................. r... ......... ...... ............ ......... ..................... ......... .................. .....v INTRODUCTION.......................................... ........ ..................,................................ ...................... 1 Study Objective................,............ ............ ...;..... ............................................. ..................... 3 STUDY AREA................................................................................................................................ 3 Yampa River ...................... ......................... ............ ............. ..... ........ ...............:......,..,.......... 3 Colorado River - 15-Mile Reach.... ............. ...... ..,....... ........ ............................ ...................... 8 METHODS........ .................. ....... .......... .... ...... ........ ......... ...... ....... .... .............. ........ ...... '" ........ .... ...12 Fish samples........... ................ ....... ............ .................... .................. ................. ........ ........... .12 Habitat mapping................................................................................................................. .13 Total Station......................................................... ,..........................,..................... ..13 Global Positioning Systems and Sonar ................................."..................................14 Acoustic Doppler and Marsh McB ernie Velocity Meters........................................ ..16 1998 Duffy Tunnel and Sevens Surveys.............................................. .................... .17 1999 15-Mile Reach Survey................................................................................... ..18 1999 Duffy Tunnel and Sevens Surveys.................................................................. .19 Data Reduction and Preparation........................................... ................................ ;...20 Hydraulic Simulation ........................................................................................................ .21 Pre-Model Modeling Using HEC-RAS.. ....... ............. ............ ............ .......... .............21 Two-Dimensional Modeling Using SMS and RMA2.........!\.....................................24 Habitat A vailabi lity ............................................................................................................. 26 RESULTS .......................................................................................................... ........................... .27 Species Composition ............. ........ .............. ............ ........ ...... ............ ............................. .....27 Yampa River Fish Samples................................................................................... ...27 Colorado River......................................................................................................... 3 0 Length Frequency and Mean Length... ..................... ..... .................................. ........ ............ .33 Density Estimates................................................................................................................3 5 Seining ........................................................................................................................... 3 7 Habitat Composition.......... .................... ...... ........................................ ......................... .... ...39 DISCUS SION .......... ,..........................................................................,........................................... 43 SlJ}.WARY AND CONCLUSIONS............. ......... .................... .............. ............................. ...... ...45 REC01\.1MENDATIONS and ADmSTMENTS TO STUDY DESIGN...........................................46 ACKN'OWLEDGEMENTS...... ............ .... ............. .... ........... .... ............... .:......... ...... ........ ... ....... .....47 REFERENCES..... ......... ....... .......... ............... ... ...... .................. ....... .......... .......... ........... ... .... .........48 APPENDIX 1: Flow Data and Hydrographs..... ................. ....... ....... ............ ............. .......... ....... .....50 APPENDIX 2: Fish Data............................................................................................ ......... ........ ...54 r,:l t:>.-! tj r 11.. t'] rl LJ r: :1 LJ ~ [>J "-.! i] f: "j U III