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 FIGURES (continued)

5. Mean daily river temperatures and minimum daily air temperatures recorded near
Jensen, UT for winters 1993-94, and 1994-95, as well as the period of observed
surface ice. Water temperatures were recorded at the USGS gage near Jensen, UT.
Minimum daily air temperatures were recorded by the NOAA weather station at

Jensen, UT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6. Mean daily river temperatures and minimum daily air temperatures recorded near
Jensen, UT for winters 1986-87, 1987 -88,as well as the period of observed surface
ice. Water temperatures were recorded at the USGS gage near Jensen, UT. Minimum
daily air temperatures were recorded by the NOAA weather station at Jensen, UT. . . . . 15

7 . Frequency of months with ice formation on the Green River from 1946 to 1992.
From U.S. Geological Survey Field Notebook; Data Courtesy of J. Schmidt, Utah

State University. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

ACKNOWLEDGMENTS

This study was funded by the Recovery Implementation Program for Endangered Fish
Species in the Upper Colorado River Basin (Recovery Program). The Recovery Program is ajoint
etlort of the U.S. Fish and Wildlife Service, U.S. Bureau of Reclamation, Western Area Power
Administration, the states of Colorado, Utah, and Wyoming, Upper Basin water users, environmental
organizations, and the Colorado River Energy Distributors Association.

This investigation was Project No. FG-l 0 of the Five Year Flaming Gorge Research Program
of the Recovery Program. The study was conducted by BIOIWEST, Inc. for 2 years under Contract
No. 90-2558 with the Utah Division of Wildlife Resources (UDWR), in cooperation with the
Flaming Gorge Work Group and the Bureau of Reclamation. Leo Lentsch, Native Species
Coordinator for UDWR, was priricipal administrator for this project, and Larry Crist, Senior Staff
Fisheries Biologist with Bureau of Reclamation, provided technical and administrative assistance.
Data on dam operations were provided courtesy of Tom Ryan and Brad Vickers, Bureau of
Reclamation, Salt Lake City, Utah. We thank Clayton Palmer, Gary Burton, and Tony Morton of
Western Area Power Administration for their collaboration and assistance in the field, as well as
John Hayse of Argonne National Laboratories.

We thank Dennis Huffman and Steve Petersburg of the National Park Service, Dinosaur
National Monument, for providing field facilities and granting of scientific collecting and boating
permits. We also thank Steven Brock and Daniel Schaad of the Ouray National Wildlife Refuge for
their cooperation, including access to roads and boat launch sites. Quentin Bradwisch of UDWR
provided field assistance and valuable winter observations. John Hawkins, William E. Davis, and
Mark Vinson provided insightful reviews of this report and valuable comments for improvement.

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