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

Table 4. Maximum weighted usable area (m2 per km) by lifestage and site.
Discharge associated with maximum WUA is in parentheses. Overall maximum
WUA for each lifestage is shaded yellow.
Maximum Weighted Usable Area (m per km) by Site
Species-LifestaEe FPR-BP FPR-HG FPR-LG
Brown-Juvenile
Brown-Adult
Rainbow-Juvenile
Rainbow-Adult
Spawning
1357 (7.31 m'/s)
7729 (11.33 m3/s)
1721 (7.31 m3/s)
10465 (16.99 m3/s)
3086 (2.83 m3/s)
1567 (4.25 m'/s)
3419 (5.66 m3/s)
1756 (2.83 m3/s)
3678 (5.66 m3/s)
185(l.70 m3/s)
2257 (4.25 m'/s)
8067 (6.97 m3/s)
2756 (3.40 m3/s)
9078 (6.97 m3/s)
1930 (3.06 m3/s)
At FPR-BP, brown and rainbow trout habitat was greatest at high discharges. The
majority of maximum WUA values occurred at discharges over 7.1 in 3/S (250 ft3/s)
(Figures 18 and 19). The average discharge for maximum WUA values was 9.15 in 3/S
(323 ft3/s). However, all life stages showed declining habitat as flows exceeded those
corresponding to the maximum WUA value. This site had the highest suitable spawning
habitat of all reaches modeled. The upstream run cross section (T3) accounted for the
majority of suitable spawning habitat. This area has a relatively uniform bottom
consisting of gravel/cobble substrate (Figure 20). The maximum spawning WUA value
occurred at a discharge of 2.83 in 3/S (100 ft3/s) with a corresponding average velocity of
0.37 m/s (1.23 ft/s) and average depth of 0.26 in (0.86 ft). This area also provides prime
foraging habitat at mid to upper discharge levels. The pool habitat at this site provides
refuge cover during periods of inactivity or low flows. At 1.13 in 3/S (40 ft3/s) the
maximum depth in this pool is greater than 1 in (Figure 21).
Wetted perimeter remains relatively uniform at high flows with the inflection point for
the run cross section occurring at 3.31 m3/s (117 ft3/s) (Figure 22). Appendix A includes
pictures of FPR-BP at four different flow levels (Figures Al-A4).
Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003
Miller Ecological Consultants, Inc. Page 28