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6. <br />evapotranspiration (Skogerboe 1982). The remaining 15 MAF are left to recharge • <br />groundwater supplies and to contribute to surface flow (Skogerboe 1982). Thirteen <br />percent of the land area contributes 75% of the surface water flow in the Upper <br />Basin (Skogerboe 1982). Major contributing areas are the Uintah Mountains and <br />Wasatch Plateau in Utah, the Wind River Mountains and Wyoming Range in <br />Wyoming, and the Park, Flattop, Front, Gore, Elk, Sawatch, and San Juan Ranges <br />in Colorado (lorns et al. 1965). <br />Climate is not only effected by elevation, but also by the barrier effect the <br />mountains provide (lorns et al. 1965). Continental polar airmasses are often <br />blocked from entering the Basin at the Continental Divide. The dominant airmass is <br />the Maritime Pacific (Critchfield 1983), except during summer when Gulf of Mexico <br />airmasses are equally important (lorns et al. 1965). • <br />STUDIES DONE IN THE UPPER BASIN <br />Studies conducted in the Upper Colorado River Basin that pertain to the rare <br />fishes were categorized based on the objectives of the studies. Major types <br />included: collection of life history information, impact analyses (such as pre- and <br />post-dam assessments), survey or monitoring (fish and macroinvertabrates), water <br />quality data collections, physical process modeling or measurement (sediment <br />movement and channel maintenance), and bibliographies. Some studies <br />encompass two or more of the above categories, such as overviews of the entire <br />0