8208

• UCREFRP Catalog Number: 8208
• Author: Osmundson, D. B., P. Nelson, K. Fenton and D. W. Ryden.
• Title: Relationships Between Flow and Rare fish Habitat in the '15-Mile Reach' of the Upper Colorado River.
• USFW Year: 1995.
• USFW - Doc Type: \
• Copyright Material: NO

LIST OF TABLES
1. Location and attributes of study sites ............................... .......... 8
2. Depths at Colorado squawfish locations within preferred habitats in
the 15- mile reach, 1986-1988 ................................... ......... 38
3. Maximum and average depth of 12 stream bed cross sections at
different flow levels, organized by habitat or channel type .......... ..... 41
4. Minimum flow levels (in cfs) known to have provided suitable depths
for a given habitat type within a given season ................. . ...... ......... 45
5. Transects where suitable depth was provided by the recommended flow ... ......... 45
6. Catch rates of young-of-the-year Colorado squawfish from the lower
Colorado River (RM 0-50) during fall and spring, 1987-1994 ........... ......... 57
7. Peak flows and mean monthly flow at the top of the 15-mile reach
during years in which peak flows approximated the recommended
peak flows ........................ .................... ... , ..... 63
8. Recommended mean monthly flows for the top of the 15-mile reach
in cubic ft/sec ............ . . . . . . . ..........
............ ......... 65
9. Volumes of water (in hundreds of acre ft) needed per 10-day period
to produce hydrographs recommended for the 15-mile reach during
the spring runoff period (April, May, June and July) ...................... ...... 66
1. List of species that have been captured in the 15-mile reach during recent years ...... 74
II. Definitions of habitat types .......... ...... ....... ...... 75
IIL Seasonal frequency (%) of use of macrohabitats in the Grand Valley
by radio-tagged adult Colorado squawfish, 1986-1989 .................... ...... 76
IV. Seasonal frequency (%) of use of macrohabitats in the Grand Valley
by radio-tagged adult razorback sucker, 1986-1989 ...................... ...... 77
V. Correction factors for scale problems associated with MIPS habitat
area measurements ............................................... ...... 80
VI. Measured and corrected mesohabitat total areas, by study site ......... ..... 81
iv