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Instream Flow ABSTRA Instream flow recommendations using a meso- populations in the Yampa and Colorado River Anderson, Rick, and Gregory B. Stewart2 ' Colorado Division of Wildlife, Grand Junction, Corvallis, OR Establishment of instream flows are generally con,, maintaining declining or threatened native fish poI research project to make biologically justified insti Anderson and Stewart (2003) designed a Meso-Ha PHABSIM in that it included a hydraulic model to habitat suitability index used to predict habitat avai surveyed with RTK GPS at six study sites on three simulate depths and velocities for each site. A larg meso-habitat criteria for two native fish, the flanne was accomplished by examining the relationship b, reaches of each study site. The physical attributes ( against fish abundance. The output of the Meso-H habitat types for each species that quantified unusa habitat availability for a range of flows. Channel g .for the Yampa River and 15-Mile Reach of Colorao were also similar and in the range of 900 to 1,200 c historic water availability the minimum base flow i was 200 cfs and it was 600 cfs for the 15-Mile Rea Gunnison River / Aspinall Unit Temperature S Cutler, Amy', and Jean Marie Boyer2 t Bureau of Reclamation; 2Hydrosphere Consultat bitat approach for native fish z Oregon State University, lered to be a valuable tool for lations. In 1999 the DOW began a )m flow recommendations. tat approach similar in concept to mulate flow conditions and a species ibility. Channel topography was vers. A 2-D flow model was used to part of the study was to develop riouth and bluehead suckers. This ween their abundance within sub- each sub-reach were correlated )itat methodology was four meso- e, unsuitable, marginal and optimal )morphology was found to be similar River. Flows that optimized habitat However because of differences in zommendation for the Yampa River - Phase II A reservoir temperature model, CE-QUAL-W2, and a river temperature model, QUAL- 2K, are used to analyze reservoir operational scenarios to determine the range of release temperatures possible from Crystal Reservoir and temperature-related effects on the Gunnison River downstream for the purpose of enhancing the survivability endangered native fish species, the Colorado pikeminnow. Historic reservoir release temperatures are compared to modeled release temperatures resulting from the proposed "Flow Recommendations", and from two hypothetical selective withdrawal structures at the 1