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4. Determine if the physical, chemical and biological attributes of the Price River are suitable for the endangered fishes. 5. Determine the biological importance of the Price River to the Green River system. An attempt was made to address all objectives. However, due to difficult sampling conditions, it is still not clear whether Colorado pikeminnow spawn in the Price River. METHODS Habitat Sampling Habitat conditions were only sampled in areas that could be waded safely and were easily accessible. Accessability was the primary factor used to select habitat sampling areas, but the habitat found in these areas seemed to be representative of habitat found throughout the study area. Habitat data were not collected from deep pools, but few of these habitats were found in the study area. Five stations located throughout the study area (Figure 2) were selected for collection of habitat data. These stations were located at river mile 0.0 (the confluence with the Green River), 20.1, 29.5, 42.2, and 48.3 (near the confluence with Grassy Trail Creek). Four to eight transects were sampled at each station, and five equally spaced points were sampled along each transect. Wetted width was measured at each transect; water depth and mean column velocity were measured at each point along the transect. Substrate size at each point was estimated; substrate categories used included clay, silt, sand, gravel, cobble, boulder and bedrock. Water temperature was measured at four sites in the Price River and one site in the Green River. Temperature data were collected every half hour from April through September with data loggers (Onset Computer Corporation). However, some of the data loggers were exposed to the air as the water Level receded. Because water temperatures did not vary greatly from site to site within the Price River, data from only one site in the Price River and one site in the Green River are presented in this report. Water chemistry data have been collected regulazly at Woodside, Utah, by the Utah Division of Water Quality since 1976. Several common water quality variables (e.g., pH, dissolved oxygen, conductivity, suspended solids, nitrates, turbidity, alkalinity, hardness, and some metals) are measured every 6 weeks, while data on other variables (e.g. biological oxygen demand, some metals, pesticides, and radiation) are collected on a sporadic basis. The U.S. Geological Survey operated a gauging station at this location from 1946 until 1992. Some data from both of these sources are used in this report. All analyses of these data were performed by the agencies that collected the data. Fish Sampling A variety offish-sampling techniques were used between April 18 and October 12, 1996, in the portion of the Price .River between the confluence with Grassy Trail Creek (river mile 48.75) and the confluence with the Green River (river mile 0.0}. Gear types used included boat and backpack electrofishing units, trammel nets, a seine, a hoop net, collapsible minnow traps, 3