9457

• UCREFRP Catalog Number: 9457
• Author: Ptacek, J. A., D. E. Rees and W. J. Miller.
• Title: A Study of the Ecological Processes on the Fryingpan and Roaring Fork Rivers Related to Operation of Ruedi Reservoir.
• USFW Year: 2003.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

Figure 25. Bed profile and water surface elevations for pool cross section at FPR-
HG. Elevation is relative elevation based on a vertical base of 100 m.
100.50 r
100.00
99.50
- - - - - - - - - - - - - - - - - - - - - -
E ------------------------------------
C
° 99.00
v
Bed Profile
98.50 1.13 cros (40 cfs)
- - - 1.70 cros (60 cfs)
- 2.27 cros (80 cfs)
98.00
- • • - 2.83 cros (100 cfs)
5.66 cros (200 cfs)
97.50
0 5 10 15 20
Station (m)
25
Wetted perimeter remains relatively uniform at high flows with the inflection point for
the riffle cross section (T6) occurring at 4.25 in 3/S (150 ft3/s) (Figure 22). Appendix A
includes pictures of FPR-HG at three different flow levels (Figures A5-A7).
An analysis of the WUA output using a habitat time series approach, indicates that
rainbow and brown trout had more suitable habitat after dam construction than before at
site FPR-HG (Figures 26 and 27). Only during a couple of short duration (1-2 week)
occasions did pre-dam habitat meet or exceed post-dam habitat. Significant increases in
habitat from pre-dam to post-dam conditions were observed during the baseflow period.
A reduction in overall habitat during the spring peak flows is evident for all species-
lifestage combinations at this site (Figures 26 and 27).
The low gradient reach (represented by FPR-LG) of the river had the highest overall
WUA values of all three reaches. The average discharge for maximum WUA values was
4.93 in 3/S (174 ft3/s). This value is intermediate between sites FPR-HG and FPR-BP.
However, as with FPR-HG and FPR-BP, all life stages showed declining habitat
Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003
Miller Ecological Consultants, Inc. Page 33