8249

• UCREFRP Catalog Number: 8249
• Author: Modde, T., W. J. Miller and R. Anderson.
• Title: Determination of Habitat Availability, Habitat Use, and Flow Needs of Endangered Fished in the Yampa River Between August and October.
• USFW Year: 1999.
• USFW - Doc Type: Project #CAP-9,
• Copyright Material: NO

Smallmouth bass often benefit from the stabilization in temperature and discharge below dams in rivers
(Beckman 1974; Cross and Collins 1975). Smallmouth bass tend to be inactive during the winter when
water temperatures are less than lOoC (Carlander 1977). Funk (1955) and Todd and Rabeni (1989)
classified smallmouth bass as a sedentary species, although some movement between pools during certain
times of the year has been documented. No smallmouth bass were present in fish collections from July
1975 to October 1977 at the Yampa River between Dinosaur National Monument and the town of Hayden
(Carlson et al. 1979). The percent composition of smallmouth bass, for all fish over 15 cm, was
estimated to be 1.1 % downstream of Sunbeam (RM 60-64) and 11 percent 50 miles upstream near Duffy
Tunnel (Anderson, in press).

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