9374

• UCREFRP Catalog Number: 9374
• Author: Valdez, R. A. and B. R. Cowdell.
• Title: Effects of Flow Regulation and Ice Processes on Overwinter Nursery Habitat of Age-0 Colorado Pikeminnow in the Green River Below Flaming Gorge Dam.
• USFW Year: 1999.
• USFW - Doc Type: FG-10,
• Copyright Material: NO

TABLE OF CONTENTS

LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11

LIST OF FIGURES ..................................................:........ 11

ACKNOWLEDGMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

EXECUTIVE SUMMARy..................................................... iv

INTRODUCTION ............................................................. 1

Background ............................................................ 2

Purpose And Objectives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

STUDY AREA ............................................................... 3

METHODS .................................................................. 4

HYDROLOGY OF THE GREEN RIVER .......................................... 7

RESULTS ................ .". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Ice Development and Breakup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Backwater Stability ..................................................... 14

DISCUSSION ............................................................... 20

Objective 1: Link Between Dam Operations and Ice Development ................21
Objective 2: Availability of Overwinter Nursery Backwaters . . . . . . . . . . . . . . . . . . . . . 23
Objective 3: Condition and Longevity of Backwaters . . . . . . . . . . . . . . . . . . . . . . . . . . .23

CONCLUSIONS ............................................................. 23

RECOMMENDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LITERA TURE CITED ........................................................ 25

APPENDIX A: DESCRIPTIONS, MAPS, AND PHOTOGRAPHS OF BACKWATERS

APPENDIX B: FLOW AND TEMPERATURE OF THE GREEN RIVER FOR WINTERS OF
1987-88 TO 1994-95