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 15. Artificial redds at Pruessing property.

Due to an unexpected high release from Ruedi Reservoir (see Hydrology results) on 14
November 2001, standpipes in both redds at the Palm property were dislodged. There
appeared to be little disturbance to the actual redd so standpipes were reinstalled without
creating a new redd. The artificial redds at the Pruessing property were protected from
the high pulse flow due to their location within the channel.
From October through March, five dissolved oxygen (DO) measurements were taken
from each standpipe. Water was pumped out of the standpipe and intragravel water
allowed to infiltrate in before a DO measurement was taken.
On 5 March 2002, freeze core samples were taken to describe the substrate composition
within each artificial redd. A control sample was taken at each site as well. The freeze
core apparatus generally followed the procedures and premises of Walkotten (1976) and
Everest et al. (1980). A hollow spike, which had one end fully closed with a point, was
pounded 0.25 m deep into the center of the redd. Liquid CO2 was used as the freezing
Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003
Miller Ecological Consultants, Inc. Page 21