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and cross section 10401 for linear relation). We classified 32 of 42 riflle transects as having curve breaks and 10 as linear and therefore no curve break (Table 4). Curve break discharges ranged from 80 to 200 cfs and averaged 161 cfs. The curve breaks covered, on average, 77% of the riffle wetted perimeter (range 34-95%). The riflle mean wetted perimeter-discharge relation was slightly non-linear and increased most rapidly with discharge between 1 and 150 cfs and then gradually approached a plateau near 500 cfs before again increasing at 550 cfs (Figure 8). Because of the approximate linear nature of the relation, no curve break was determined. The total rifIle surface area-discharge relationship was nearly linear for all flows examined (Figure 9), and thus no curve break point was produced. Curve breaks were also calculated for width, depth, and velocity (Appendix 5). The mean curve break point for riflle and run width was 155 cfs, depth 152 cfs, and velocity 131 cfs. WUA vs. Discharge WUA was calculated for three sets of criteria for each ofthe three experimental flows. All three criteria showed approximate linear relations for the discharges examined (339,424, and 552 cfs; Table 5). Appendix 6 gives a detailed breakdown for each habitat cluster at discharge 339 cfs. We modeled the WUA-discharge relation between 1 and 600 cfs (Figure 10). The first criterion was that developed :from the White River data. It showed an almost linear increase in WUA as flows increased from 10 to 600 cfs. The second criterion was the night foraging data :from the Yampa River. It showed WU A score almost identical to the White River data. This was the result of very similar HSI data sets for both depth and velocity. The third criterion was for diurnal resting fish, also developed :from Yampa River data. This showed very low WUA score 11