Final Programmatic Biological Opinion for Bureau of Reclamation's

TABLE OF CONTENTSConsultation History ..............................................3Scope of the Biological Opinion .....................................5BIOLOGICAL OPINION ....................................................5DESCRIPTION OF THE PROPOSED ACTION .............................5STATUS OF THE SPECIES AND CRITICAL HABITAT .....................19Colorado Pikeminnow ...........................................19Species/Critical Habitat Description ...........................19Status and Distribution .....................................20Life History .............................................22Population Dynamics ......................................25Analysis of Species/Critical Habitat Likely to be Affected ...........25Razorback Sucker ..............................................28Species/Critical Habitat Description ...........................28Status and Distribution .....................................29Life History .............................................30Populations Dynamics ......................................32Analysis of Species/Critical Habitat Likely to be Affected ...........32Humpback Chub .....................................................32Species/Critical Habitat Description ...........................32Status and Distribution .....................................33Life History .............................................33Population Dynamics ......................................34Analysis of Species/Critical Habitat Likely to be Affected ...........34Bonytail ......................................................34Species/Critical Habitat Description ...........................34Status and Distribution .....................................35Life History .............................................35Population Dynamics ......................................35Analysis of Species/Critical Habitat Likely to be Affected ...........35IMPORTANCE OF THE 15-MILE REACH ................................36FLOW NEEDS FOR ENDANGERED FISHES .............................37ENVIRONMENTAL BASELINE ........................................39Status of the Species Within the Action Area ....................42Factors Affecting Species Environment within the Action Area .......44EFFECTS OF THE ACTION ...........................................44Factors to be Considered .........................................44Analyses for Effects of the Action ...................................45Species and Critical Habitat Response to the Proposed Action .............63CUMULATIVE EFFECTS .............................................67CONCLUSION ......................................................67