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RECOVERY PRffiRAM FOR TIIE ENDANGERED FISHES tr: OF TIIE UPPER COIORAm U.s. Rsh and Wildlife SaM.. . P.O. Box 25486 . Denver Federal Canter . Denver, Colorado 80225 . (303) 236-2985 PROLOGUE '. This is the second of two reports that collectively provide recommendations for year-round flows in the IS-mile reach of the upper Colorado River. The conclusions and recommendations presented in the report are based on the best available biological information. A study is currently being conducted that will help refine these recommendations. This study will relate habitat quality, quantity, and diversity to incremental river discharge levels. A third report will be prepared in 1992 that will include the results of the new study, summarize recommendations made in the two preceding reports, and include appropriate modifications to the flow recommendations based on the new information. Future studies in the upper Colorado River subbasin will no doubt provide additional information and improve our understanding of the relationships between flow and the well-being of endangered fish populations. As a result, there will be a continuing effort to refine the recommendations for flows needed to recover these species. A more riverwide approach will be needed which would include the flow needs of humpback and bony tail chub, species that do not inhabit the Grand Valley and are therefore not considered in these reports. The Recovery Program's Implementation Committee has the responsibility for implementing the flow recommendations contained in this report. Consequently, the report will be transmitted to the Implementation Committee for their immediate consideration. ."'<',r. C,l".., ",.r ~,l.l, Implementation Program -. U.S. Fish and Vllildlife Service . U.S. Bureau of Reclamation . Western Area Power Administration Colorado . Utah . Wyoming . Environmental Groups . Upper Basin Water Users ii .