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Patia River Fish Monitoring Annual Report day. The daily range of temperatures among trips ranged from 16.2° C in July to 4.6° C in November (Trip 98-6). The wide, shallow character of the Paris and the open canyon in which it flows are conducive to wide fluctuations in water temperature. In the summer, the Paris River warms rapidly during the day, as evidenced by a 16.2° C temperature change over the approximately four hours that it took to sample all sites. Since we conclude our sampling by 15:00, the maximum temperature and temperature range of the Paris River is undoubtedly higher. The ~ converse is true during winter, when the stream cools rapidly at night. During the December sample, there was ice (2-3 mm thick) along shore and surrounding exposed rocks and frazil ice floating downstream. However, the ice melted by approximately 11:30 and water temperature increased from 0.2° C at 10:40 to 4.9° C at 13:50. Warmer temperatures (5.4° C) were later recorded in the mouth as water from the Paris and Colorado rivers mixed Turbidity In 1998, turbidity in the Paris River ranged from 22.9 NTU in June to 105,500 NTU in July (Table 3). Turbidity tends to be less in the ponded mouth of the Paris River, where the clear water of the Colorado River dilutes the sediment in the Paris and reduced velocity causes the fine sediment to precipitate. Turbidity in the Paris River is mostly dependent upon flooding. At base flow, the Paris is a slightly turbid river, measuring approximately 30 NTU. The Paris River is an alluvial ~ stream and drains 3730 kmZ of southern Utah and northern Arizona (Topping 1997). The Paris River is the second largest contributor of sediment to the Colorado River, delivering 23,000 tons of sediment /year (Andrews 1991). Turbidity appears to be used by native fishes as a form of cover -fish are more likely to be captured in shallow water at a turbidity of >30 NTU (Valdez and Rye11995; Arizona Game and Fish Department 1996a). Its characteristic high turbidity and high summer temperature may be a laxge factor in limiting the species diversity of the Paris River. , velocity Velocity was only measured during November. Mean velocity for the 12 sites samples • Hoffnagle 1999, Paris Rivet 1998 Annual Report Arizona Game dt Fish Departrnent 7