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TABLE OF CONTENTS <br />List of Tables ....................................................................................................................... ii <br />List of Figures .................................................................................................................... . iii <br />Acknowledgments .............................................................................................................. . iv <br />Executive Summary .......................................................................................................... .. V <br />Introduction ....................................................................................................................... ..1 <br />Study Area ......................................................................................................................... ..3 <br />Hydrology ................................................................................................................... .. 3 <br />Characteristics of Study Reaches ................................................................................. ..6 <br />Methods ............................................................................................................................... .. 9 <br />Aerial Photograph-GIS Analysis ................................................................................. ..9 <br />Sediment Loads .......................................................................................................... 10 <br />Field Studies ................................................................................................................ 16 <br />Results ................................................................................................................................. 19 <br />Historical Changes in the Geomorphology of the Rifle-DeBeque Reach .................... 19 <br />Trends in Suspended Sediment Loads ......................................................................... 22 <br />Longitudinal Trends in Channel Characteristics .......................................................... 27 <br />Thresholds for Coarse Sediment Transport ................................................................. 33 <br />Discussion ........................................................................................................................... 39 <br />Conclusions ........................................................................................................................ 41 <br />Recommendations .............................................................................................................. 42 <br />Bibliography ...................................................................................................................... 43 <br />Appendices .............................................................................................................. Al - A12 <br />i