403;404(b)''CBFWC^ncl1.5Q4/.eBFWC .Amendment-applications 403.404(b);. CBFWC and 

 1504 CBFWC propose"to increase the levels of interim spill to 31- 41 and 41 percent, respectively, 

 of the average darly flow at Lower Monumental. Ice Haroor. and The Dalles dams, respectively to 

 provide merea'sed smoit survivalover thepresent program spill reqiHrements and to protect 80 

 percent of the spring and summer migrations. 



The Council proposes to reject the fish and wildlife agencies and tnbes applications This is 

 the second time the Council has considered the spill issue m 1986 On February 13. 1986. the 

 Council rejected this same spiH application while extending the duration of the program s spill 

 requirements to provide at least 90 percent smoit survival for 80 percent of the spring and summer 

 migrations. Since that time, the region s fish and wildlife agencies and tribes have resubmitted the 

 interim spill amendment application to the Council TheCouncil has circulated applications 

 403.404(b) CBFWC and 1504' CBFWC for public comment and has heard comment from the 

 proponents and others The Council believes that no additional scientific knowledge has been 

 offered to support the application since February 1986 



After carefully considering this matter again, the Council believes the best available scientific 

 knowledge shows that an increase m spill levels from the present program requirements would not 

 effectively increase upnver runs m the interim period until bypass systems are installed. 

 Cumulative effects of reservoir mortalities would tend to negate any biological benefits of additional 

 interim spill Differences in systemwide smoit survival between the proposed amendment ano the 

 existing measure are about one to two percent (Depending on water condition), based on model 

 studies conducted m 1985 and 1986 m cooperation with the Councils Mainstem Passage Advisory 

 Committee (MPAC) This represents only about a one percent improvement irvaverage survival at 

 each mainstem dam The-Gorps has assured the Council that m above average.water years spill 



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