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iv -:: (>3600 cfs). Microhabitat data were collected by species, physi- cal acti vity, and 1 i fe stage duri ng three time peri ods: pre-test, high flow test, and post-test. The study area was defined as the 18 km of river between ~ Flaming Gorge Dam and Red Creek. Most microhabitat data were collected from the first 7 river km below the dam. An intensive study site was located approximately 2.4 km below the dam. Physical, invertebrate, and vegetative data were collected in the intensive study site for use in the hydraulic and habitat models. Rainbow and cutthroat trout were the most numerous fish species in the study area. Populations for both species were sustained through extensive fingerling stocking by the UDWR. Bro~m trout were found in low numbers in the study area, but they were common below Hed Creek. All other species of fish ob- served in the study area were found in low numbers. Ivlethods Fish microhabitat is defined as the physical (and occasion- . ally chemical or biological) variables that define (and presum- ably influence) the exact location occupied by a fish and which change or caul d potenti all y change wi tt! small changes in the fish's location. Variables which are normally constant over large sections of river (such as temperature, volume of flow, conductivity, dissolved oxygen, etc.) are considered macrohabitat variables. Macrohabitat variables were not measured in this study. _""_'.~'-': ,_m:1!tI