14 



The following conclusions pertain to the Beaverhead River below 

 the confluence of Grasshopper Creek (mile 12 to 69). 



1. Average daily flows less than 25 cfs, which have occurred 

 in sections of the river 18 and 38 miles below Clark Canyon 

 Dam, have undoubtedly affected aquatic life. 



2. The numbers and biomass of trout in only one of six study 

 sections in this portion of the Beaverhead River increased 

 following the flow increases that occurred between Spring, 

 1975 and 1976. 



3. Other factors, notably sediment, cover, and toxic metals, 

 are operating in conjunction with flow to limit trout 

 populations in much of the river below Grasshopper Creek. 



4. Sedimentation appears to be a major factor limiting trout 

 populations in the lower reaches of the river (mile 52 to 

 69). 



