28 



Section 8. Anderson Lane (38). This section began approximately 

 38 miles below Clark Canyon Dam at the Anderson Lane bridge. Section 

 length was 9930 feet. 



Section 9. Blaine (52). This section began approximately 52 miles 

 below Clark Canyon Dam at a point approximately 0.2 mile upstream of 

 Point of Rocks. Section length was 17837 feet. 



Brown trout ( Salmo trutta ), rainbow trout ( Salmo gairdneri ) , 

 mountain whitefish ( Prosopium will iamsoni ) , burbot ( Lota lota ), white 

 sucker ( Catostomus commersoni ), longnose sucker ( Catostomus catostomus ), 

 mottled sculpin ( Cottus bairdi ), and longnose dace ( Rhinichthys 

 cataractae ) were common in the study sections of the Beaverhead River. 

 Brook trout ( Salvelinus fontinalis ) and mountain sucker ( Catostomus 

 platyrhynchus ) were uncommon. Carp ( Cyprinus carpio ) were common in 

 the Blaine (52) Section and uncommon elsewhere. 



RESULTS 

 Trout-Flow Relationships in the Hildreth Section 



Results for the Hildreth Study Section will be discussed separately. 

 More flow and fish population data was collected in this section than 

 in the other study sections. 



Numbers and biomass of brown and rainbow trout in the Hildreth 

 Section were estimated in the spring and fall between October, 1966 and 

 March, 1976. Fall estimates during this period were made between 

 September 20 and October 28. Spring estimates were made between March 1 

 and April 2. Age I and age II trout were the youngest group estimated 

 in the fall and spring, respectively. 



