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. . shiner, sand shiner, smallmouth bass and white sucker. Post-LarvaL- Mean daily flow averages at the Randlett gage ranged from 300 - 765 cfs during post-larval sampling in 1997,473 - 1150 cfs during 1998, and 801 - 1411 cfs during the 1999 post-larval sample period. During all years of the study all available backwater and low flow shoreline areas were seined as crews proceeded down river through the study reaches. Recorded main channel temperatures ranged from 16 - 220 C in 1997, 17 - 230 C in 1998, and 19 - 220 C in 1999. Temperatures of areas sampled ranged from 16 - 260 C in 1997, 17 - 280 C in 1998 and 18 - 240 C in 1999. A total of 18 fish species were collected during post-larval sampling. These included four native and fourteen nonnative species. Native species collected each year were speckled dace, flannelmouth sucker, bluehead sucker and roundtail chub. These four species accounted for 0.6 % of the total fish collection in 1997,6.2 % in 1998 and 2.3 % of the total fish collected in 1999 (Table 4). The most common native species collected were speckled dace in 1997 (1.17 fish/100m2) and 1998 (4.94 fish/100m2), and roundtail chubs in 1999 (10.17 fish/100m2). Roundtail chubs made up 49% of the total native fish collection in 1999. All chubs collected were identified as YOY. One was collected in the Ouray site in 1997, and the rest were caught in backwater habitats of the higher gradient Uinta and Myton sites. Speckled dace were found throughout all sampled study sites. However, the highest catch rates occurred in the Myton site and were dominated by YOY (Table 5). Red shiners and fathead minnows were consistently the most numerous species collected using seines and comprised 85 - 90 % (227.47 fish/100m2 and 99.46 fish/100m2 respectively) of the total catch during each of the three years. These two species were abundant or dominant throughout all habitats (Table 5). Sand shiners were also common and made up 5 % (13.01 fish/100m2) of the total catch. Relative abundance of sand shiners was consistently higher in the Ouray site. Redside shiners (Richardsonius balteatus) were abundant only in the Myton site (8.31 fish/100m2), above the confluence with the Uintah River and were not collected in the Ouray site. Black bullhead catfish, black crappie, bluegill sunfish, channel catfish, largemouth bass (Micropterus salmoides), smallmouth bass, and Utah chub (Gila atraria), were found in relatively low numbers (< 0.2 fish/100m2). Black crappie were only found in the Ouray site. Green sunfish, smallmouth bass and white sucker were found dispersed throughout all study sites. . . . . . . . . 8 .