7762

• UCREFRP Catalog Number: 7762
• Author: Valdez, R. A. and B. R. Cowdell.
• Title: Annual Summary Report-1994, Effects of Flow Regulation and Ice Formation on Overwinter Nursery Habitat of Age-0 Colorado Squawfish in the Green River Below Flaming Gorge Dam.
• USFW Year: 1994.
• USFW - Doc Type: \
• Copyright Material: NO

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TABLE OF CONTENTS

P82e

ACKN'OWLEDGEMENTS ......................................................... v

1.0 IN1'RODUCflON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1

2.0 STUDY AREA ............................................................... 1

3.0 METIiODOLOGY ............................................................ 3

3.1 RIVER HYDROLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

3.2 BACKWATER MAPPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

3.3 WINTER HABITAT MEASUREMENTS .................................... 4
3.4 DATA COLLECTION AND STORAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' 5

4.0 RIVER HYDROLOGY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5
4.1 MONTHLY FLOWS FROM FLAMING GORGE DAM . . . . . . . . . . . . . . . . . . . . . . . .. 5
4.2 DAll..Y FLOW FLUcruATIONS FROM FLAMING GORGE DAM .............. 5

4.3 RIVER FLOWS IN STUDY AREA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

5.0 WINTER RIVERIN'E CONDmONS .............................................. 7

5.1 AIR AND WATER TEMPERATURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7

5.2 ICE CONDmONS ..................................................... 8

5.2.1 Frazil Ice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8

5.2.2 Surface Ice ................................................... 10

5.2.3 Jam Ice ...................................................... 10

6.0 RESUL1'S .................................................................. 10
6.1 MINIMUM HABITAT REQUIREMENTS .................................. 10
6.1.1 Physical Habitat Criteria ......................................... 10
6.1.2 Chemical Habitat Criteria ........................................ 11
6.2 WINTER CONDmONS WITHIN BACKWATER HABITA1'S . . . . . . . . . . . . . . . . . .. 11

6.2.1 Reach 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12

6.2.2 Reach 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13

6.2.3 Reach 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 14

7.0 SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15

LrrERA11JRE CITED ........................................................... 16

GLOSSARY ................................................................... 17

UST OF APPENDICES

APPENDIX A . FIELD CODES AND DATA FORMS

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