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<br />TABLE OF CONTENTS
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<br />LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , , . . , , . . . . . , . , , .. IV
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<br />LIST OF FIGURES . . , . . . . . . . . . . . . . . , . . , . . . . . , . . . . . . . . . . , . . . . . . . . . .. V
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<br />PREFACE .......................................,............... 1
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<br />PART I - General Overview ......... , . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . .. 1
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<br />INTRODUCTION . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1
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<br />PROPOSED CRITICAL HABITAT DESIGNATION ,.......,........... 2
<br />Razorback Sucker ....... ... . , . . . . . . , . . , , . . . . . . . , . . . . . . . . .. 6
<br />Colorado Squawfish , . . . . . . . . . . . . . . . . . , , , . . . . . . . . . . . . , . . . .. 8
<br />Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
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<br />Bony tail . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . .. 10
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<br />PART 11- Biological Overview .......,.................................. 12
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<br />BACKGROUND . , . . . . . . . . . . . . . , . . . . . . . . , . . . . . . , . , . . . . . . . . . . .. 12
<br />HABITATS AND STATUS OF ENDANGERED FISHES......... ...... .. 13
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<br />General ............................................... 13
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<br />Razorback Sucker ...................,.................... 13
<br />Colorado Squawfish . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . .. 15
<br />Humpback Chub . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . .. 15
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<br />Bony tail , . . . . , , , . , . , . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
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<br />D~TERMINATION OF CRITICAL HABITAT .................,...... 17
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<br />General ............................................... 17
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<br />Water ........................."...................., 17
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<br />Physical Habitat ...................,...,................, 17
<br />Biological Environment ..... _' . . . . . . , . . . . . . . . . . . . . . . . , . . . . .. 17
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<br />PART lIT - Economic Overview ..................,...............".... 19
<br />ECONOMIC SETTING. . . . . . . . . . . . . . . . . . . , . . . . . , . . . . . . , . . . . . . .. 19
<br />Economic Output ........................................ 19
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<br />Employment, , , . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20
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<br />Historical Development of the Basin ...............,........... 20
<br />~ODELINGOVERVIEW ...".....,."......................... 20
<br />THE MODELING APPROACH ...,............................... 21
<br />Without Fish and With Fish Scenarios ......................... 21
<br />Aggregation of Producing Sectors . . . . , . . . . . . . . , . . . . . . . . . . . . . .. 22
<br />Flow Activities . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . .. 23
<br />Nonflow Related Activities . . . . . . . . . , , . . . . . . . . . . . , . . . . . . . . . .. 26
<br />The Division Between Listing and Critical Habitat ................. 27
<br />DIRECT ECONOMIC IMPACTS .....,..,......................... 28
<br />STATE- AND REGIONAL-LEVEL ECONOMIC IMPACTS. . . , . . . .. . . . . ., 30
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