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The hydrology included historical flows for purposes of developing regression models both to predict initial headwaters and water tempera- • tures and to aid in validating the model. The hydrologic data also provided the ability to "game" with the flows to determine the effect of flow regimes on the temperature regimes. Much of the computer modeling effort was devoted to generation of the input files. Obviously, such site specific orientation required a unique development effort which could not be obtained from other sources even if the "processing" components were sufficiently accurate. Stream System Structure The temperature model was applied to the Green and Colorado River networks and their major tributaries (Figure 3). The Green River was modeled from below Flaming Gorge Dam using the Greendale Wyoming gage for estimates of initial flows and temperatures. Most of the tribu- taries emptying into the Green River were modeled as point loads; these included all of those tributaries with flows recorded near the conflu- ence with the Green River (the Duchesne, Price, and San Rafael Rivers). The White River was modeled from the gage near Watson, Utah. The Yampa River was modeled from above the confluence with the Little Snake River; recorded flows and temperatures from the Little Snake gage near Lily, Colorado and the Yampa River gage near Maybell, Colorado were combined to approximate initial conditions on a pseudo tributary with a headwater 22 miles above the Little Snake/Yampa confluence. The Colorado River was modeled from the gage near Cameo, Colorado. • The Gunnison River was modeled as a point load to the Colorado and its effect was estimated from flows and temperatures recorded near Grand Junction, Colorado. The Dolores River was also modeled as a point load. The current data preprocessing computer program allows for one diversion upstream of Green River, Utah, on the Green River (and subse- quent return flow below Green River) and one diversion upstream of Grand Junction, Colorado, on the Colorado River with the return flow below Grand Junction. USGS topographic maps (7.5 and 15 min) and Reclamation profile plots were used to determine elevations, stream slopes, site locations (river miles and latitude/Longitude), and the extent of solar shading due to canyon walls. Meterology Climatological data were developed from the U.S. Department of Commerce, National Oceanic and Atmospheric Administration records for Grand Junction, Colorado. Local Climatological Data, Annual Summary, 1949-1980 were used for the daily information of temperature, wind speed and relative humidity. Normals for the period of record were also taken from the Annual Summary. • 10