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7/14/2009 5:02:31 PM
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5/20/2009 10:10:47 AM
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UCREFRP
UCREFRP Catalog Number
7848
Author
Burdick, B. D.
Title
Minimum Flow Recommendation For Passage Of Colorado Squawfish And Razorback Sucker In The 2.3-Mile Reach Of The Lower Gunnison River
USFW Year
1997.
USFW - Doc Type
Redlands Diversion Dam To The Colorado River Confluence.
Copyright Material
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TABLE OF CONTENTS <br />LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . v <br />LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v <br />LIST OF APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . vii <br />ACKNOWLEDGEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . xi v <br />EXECUTIVE SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv <br />INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1 <br />Background . . . . . . . . . . . . . . . . . . . . . . . 1 <br />Interim Cooperative Water Agreement . . . . . . . . . . . . . . . . 5 <br />Purpose and Objectives . . . . . . . . . . . . . . . . . . . . . . 5 <br />STUDY AREA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br />General . . . . . 6 <br />Lower Gunnison River (2.3-Mile Reach) . . . . . . . . . . . . . . . 6 <br />METHODOLOGY . . . . . . . . . . . . . . . . . . . 7 <br />Biological . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br />E1 ectrofi shi ng . . . . . . . . . . . . . 7 <br />Hydrological . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 <br />BR Transects . . . . . . . . . . . . . . . . . . 8 <br />FWS Transects . . . . . . . . . . . . . . . . ... 9 <br />Data Compilation and Analysis . . . . . . . . . . . . . 9 <br />Fishery Data . . . . . . . . . . . . . . . . . . . . 9 <br />Past Sampling . . . . . . . . . . . . . . . . 9 <br />Current Sampling . . . . . . . . . . . . . . . . . 10 <br />Discharge . . . . . . . . . . . . . . . . . 10 <br />Approach For Recommending Minimum Streamflow . . . . . . . . . . . 10 <br />RESULTS AND DISCUSSION . . . . . . . . . . . . . . . . . . . . . . 12 <br />Fish Captures . . . . . . . . . . . . . . . . . . . . 12 <br />Colorado squawfi sh . . . . . . . . . . . . . . . . . . . . . 12 <br />Past Sampling . . . . . . . . . . . . . . . . . . . . . 12 <br />Current Sampling . . . . . . . . . . . . . . . . . . . 13 <br />Other Common Fishes . . . . . . . . . . . . . . . . . . . . . 13 <br />Catch Rate versus Flow . . . . . . . . . . . . . . . . . 16 <br />Hydrology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 <br />River Discharge . . . . . . . . . . . . . . . . . . . . 19 <br />BR Transects . . . . . . . . . . . . . . . . . . . 20 <br />FWS Transects . . . . . . . . . . . . . . . . . . . . . 23 <br />Summary of Transect Data . . . . . . . . . . . . . 25 <br />Flow Exceedence . . . . . . . . . . . . . . . . . . . . . . . 27 <br />SYNTHESIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 <br />River Management . . . . . . . . . . . . . . . . . . . . . . 28 <br />Low- and Moderate-Water Years . . . . . . . . . . . . . 28 <br />Minimum Flow Recommendation . . . . . . . . . . . . . . . . .. 31 <br />ill
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