/'. 



The biological and water surface profile data collected in this study 

 would support the management of the upper Beaverhead River (Hildreth 

 Section) for a minimum average daily flow of approximately 250 cfs. An 

 evaluation of the water surface profile data suggests the 250 cfs 

 minimum would apply to the lower river as well. However, other factors 

 adversely affecting fish populations in the lower river may minimize 

 any benefits gained by increased flows during the irrigation and non- 

 irrigation seasons. Limited biological data collected during this study 

 does suggest that factors other than flow are contributing to the 

 decline in numbers and biomass of trout that occurs between the upper 

 and lower river. 



