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

LIST OF TABLES

1.

Purpose and dates of fields trips on the Green River for the winter ice study. .........6

")

Minimum, maximum, and mean daily flows (cfs) and volumes (acre-feet) of the
Green River for November through March, 1993-94 and 1994-95, as measured at
Greendale, Utah (USGS gage 09234500) and at Jensen, Utah (USGS gage 09261000)

..................................................................... 8

3. Summary of overwinter habitat suitability of 14 backwaters sampled during winter
of 1993-94. CH = chute channel, SC = scour channel, ER = eddy return channel. . . . . 1 ~

4. Summary of overwinter habitat suitability of9 backwaters sampled during winter of
1994-95. CH = chute channel, SC = scour channel, ER = eddy return channel . . . . . . . 17

5. Average surface ice thickness, free water depth, water temperature, and dissolved
oxygen (D.O.) for 14 backwaters sampled during Trip I (January 31 - February 4,
1994) and TripII(February21-24, 1994) of winter, 1993-94. CH=chutechannel,
SC = scour channel, ER = eddy return channel '" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6. A verage surface ice thickness, free water depth, water temperature, and dissolved
oxygen (D.O.) for 9 backwaters sampled during Trip I (January 6- 8, 1995) and Trip
II (February 6 - 7, 1995) of winter, 1994-95. CH = chute channel, SC = scour
channel, ER = eddy return channel ......................................... 19

7. Summary of parameters observed for experimental winter releases from Flaming

Gorge Dam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

LIST OF FIGURES

I.

General location and sampling reaches on the Green River. .. . . . . . . . . . . . . . . . . . . . . . 5

")

Hourly releases from Flaming Gorge Dam (converted from megawatts to cubic feet
per second), and hourly flows of the Green River near Jensen, Utah (USGS gage
09261000) for December through February of 1993-94 and 1994-95. (Megawatt data
courtesy of Brad Vickers, Bureau of Reclamation). .............................9

...
-'-

Representative average and extreme hourly releases from Flaming Gorge Dam for
January and February, 1994 and 1995. (Converted from megawatts to cubic feet per
second, megawatt data courtesy of Brad Vickers, Bureau of Reclamation). . . . . . . . . . . 10

4.

Monthly maximum and minimum air temperatures (average of daily maxima and
minima) for the winters of 1993-94 and 1994-95, compared to average temperatures
recorded at the NOAA weather station in Jensen, UT. .......................... 12

II