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. . . <:::) ('J N c.c c...~ Q') in 1969 to 1971, based on black and white photo interpretation and field reconnaissance. STUDY AREA The study area involves appro~imately 410 square miles of land in the Uinta Basin including the Duchesne River to Uinta River area in the western part of the Basin and the Ashley Valley area in the eastern part, as shown in Figure 1. The study stretches from Duchesne City on the west to Jensen on the east, and from Ouray on the south to Mountain Home and Vernal on the north. While no mountain area wetlands are included the study encompasses more than 90% of the agricultural and wetland coverage in the Basin floor area. Figure 2 shows the position of the 38 USGS 7~ minute quadrangles involved, in whole or in part. CLASSIFICATION Various classes of "water-related" land use and of wetlands were explored in the study. The classification suggested by the DWR is shown in Table 1. Field investigation showed that only 10 of the 18 crop types listed are found in the Uinta Basin -- corn, barley, oats, alfalfa, native grass hay, cultivated grass and other hay, pasture, wetland pasture, native grass pasture, and idle. No dry cropland of any significance was found. Further, it was found that there is a tremendous variability in the condition of these crops in the field, depending on stage of growth or harvest, amount and timing of irrigation water applied, and general management practices. It was found in many cases that there was greater variability in appearance and production within classes than between them. Thus, it was impossible to detect even from the U-2 color infrared photography all ten types or classes. -6-