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 FIGURES (Continued)
16. Total area (top graph) and total weighted area (bottom graph)
of preferred habitats ............................................ ........ 34
17. Habitat frequency of use by adult squawfish during winter ............... ........ 35
18. Winter habitat preference of adult Colorado squawfish using one
or more of the four 15-mile reach study sites ......................... ........ 36
19. Total weighted area of preferred habitats during winter ................. ........ 36
20. Mean depth at squawfish locations in the 15-mile reach, 1986-1988 ....... ........ 38
21. Placement of transects within the four 15-mile reach study sites ........... ........ 40
22. Density of habitats in the study reaches at various discharge levels ......... ........ 48
23. Change in bed elevation across a backwater in Site 3 over a three-year period ........ 52
24. Change in bed elevation across the mouth of a backwater in Site 3 ......... ........ 53
25. Average hydrographs for the 15-mile reach for four precipitation-level
categories .................................................... ........ 61
26. Average discharge for each 10-day period in hydrographs recommended
for the spring months of April, May, June and July in the 15-mile reach ..... ........ 64
27. Recommended flows for the 15-mile reach in comparison with
historic (1902-1942) and recent (1954-1993) periods ................... ........ 66
1. Peak discharge (cfs) at the top of the 15-mile reach, 1982-1993 ........... ........ 78
U. Sediment transport capacity of the Colorado River just upstream of
the 15-mile reach (based on discharge records from USGS gage at Cameo) .. ........ 79
III. Variation in stage and maximum depth with flow level at Transect No. 1 .... ........ 98
W. Variation in stage and maximum depth with flow level at Transect No. 2 .... ........ 99
V. Variation in stage and maximum depth with flow level at Transect Nos. 3,
4and5 ...................................................... ....... 100
VI. Variation in stage and maximum depth with flow level at Transect No. 6 ... ........ 101
VII. Variation in stage and maximum depth with flow level at Transect Nos. 7
and 8 ...................................................... ........ 102
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