Introduction 



VTith the exception of the ImnaJia River, there are no 

 streams of present or potential major importanoe to salmon 

 on the Oregon side of the Snake River in this area. This is 

 mainly due to extensive irrigation use, and the restoration 

 of natural salmon production in this area would entail not 

 only the screening of a great many irrigation diversions, 

 but also the even greater difficulties of maintaining suffi- 

 cient flows and proper water temperatures, and the construction 

 of fishways over several large storage reservoir dams of fluctu- 

 ating water level. Moreover, the salmon runs in this area are 

 now in such a state of depletion that sufficient spawns rs are 

 not available for the rehabilitation of the runs by mesins of 

 artificial propagation. For these reasons the report on this 

 section cannot hold forth much hope for restoration of salmon 

 runs in streams other than the Imnaha River. 



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