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Gunzuson River / Aspinall Unit Temperature Analysis -Phase I Page 4 2. DATA COLLECTION A significant data collection effort was undertaken for phase I of the project. The goal of the data collection task was to provide: • A basis for determining whether or not additional field work was needed before a modeling effort could begin; • A database from which any future temperature modeling effort could quickly and easily assemble data necessary for model development and execution; and A basis for preliminary analysis of temperature trends in the basin, from which an initial recommendation on the feasibility of obtaining warmer temperatures near Delta could be provided. This report provides a summary of the data collected. Records of Gunnison River temperatures were obtained from George Smith of USFWS, and of Crystal, Morrow Point, and Blue Mesa reservoirs from Matt Malick of the National Park Service. Numerous other data sources were used as well, as outlined below and in the Appendix. Overall, the data appear to be good quality and should not be a limiting factor in the successful development of a set of mathematical models. Types of data collected included time series records of stream flow, reservoir contents, stream and reservoir water temperatures, daily minimum, mean and maximum air temperatures, precipitation, wind speed and direction, and dewpoint. In addition, data on certain other physical parameters such as reservoir outlet structure elevation and streambed geometry were gathered. A total of approximately 76 Megabytes of data in electronic forms were collected. These include several MSAccess databases and Excel spreadsheet files, as well as raw ASCII text files. Other formats of information include numerous written reports, information gleaned from various government web sites, and numerous emails and personal communications with individuals either involved in the Recovery Program or with other water related facilities in the Gunnison Basin. For obvious reasons, we do not include the data in this report. However, data sources are listed in the references section, highlighted with and asterisk (*), and the Appendix provides summary tables of the larger data sets collected. As part of the data collection exercise, we also attempted to identify past temperature modeling efforts in the Gunnison Basin. The only significant temperature modeling effort we know of is the CE-THERM model of Blue Mesa Reservoir developed by Brett Johnson of CSU (Johnson et al., 1996). This model is aone-dimensional (vertically layered) model of Blue Mesa, and has been used primarily to examine potential in- reservoir temperature impacts resulting from possible changes in reservoir release patterns. Although the model itself addresses in-reservoir temperature, it does not address potential impacts of a TCD. Hydrosphere Resource Consultants