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Trout Populations The evaluation of fish populations in the Fryingpan River relied on a literature review of Colorado Division of Wildlife (CDOW) reports and data that date to the 1940s. Information extracted from the reports and summarized here included fish abundance records, fish stocking records, and recent investigations on whirling disease. The main reports for pre-dam fish population data came from Hunter and Parson (1943) and Burkhard (1967). Post-dam information relied on reports from Hoppe and Finnell (1970), Finnell (1972), Finnell (1977), Nehring (1980), and Nehring and Thompson (2002). Data presented in all of those reports included relative abundance, some information on length frequency, information on length at age, and comparisons of population numbers and stocking numbers over time. Thermal Regime The purpose of this portion of the study was to describe the thermal regime of the Fryingpan River and document its effects upon the Roaring Fork River. On 21 June 2001, we installed instream temperature thermographs, which were set to begin recording on 23 June 2001, at two sites in the Fryingpan River (gaging station and upstream of the confluence) and two sites on the Roaring Fork River (upstream of the Fryingpan River and downstream of the Fryingpan River at USFS "Tree Farm"). The lower Roaring Fork River site (USFS "Tree Farm") location was selected to insure adequate mixing of Fryingpan River water. We used Stowaway® Tidbit® temperature loggers (accuracy ±0.2°C) encased in a small (10 cm) section of pvc pipe for protection. Capsules were placed in the river and attached to a permanent object by aircraft cable. Each capsule was drilled with holes to ensure adequate water circulation. Each thermograph was set to record water temperature every hour and downloaded every few months using a Stowaway(g) Optic ShuttleT"' Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003 Miller Ecological Consultants, Inc. Page 23