232 



DRAFT 



states, "Because of the high levels of spill that occurred at some projects in 1991, 

 monitoring crews were alerted to note any evidence of 'gas bubble' disease in the fish 

 sampled. There were no reports of injury to fish as a result of gas supersaturation" 

 (page 22, FPC 1991 Annual Report). 



Page 65, 2.1.9. Water Flow Rates 



"Major rivers (native salmonid runs) identified as being seriously 

 impacted by irrigation were the Deschutes, Hood, John Day, McKenzie 

 arid Santiam Rivers. ' 



Anadromous salmonid populations are not seriously impacted by irrigation withdrawals l 



in the McKenzie River basin. A portion of this basin, The Mohawk River, is adversely 

 affected by irrigation withdrawals but this activity only affects resident fish populations 

 (per. comm. ™ 



igaiion wiuiurawais uui uus acuviiy uiujf aiit^is kp^iuuh. nan iwi^uianv/.u , 



Mark Wade, ODFW Biologist, Nov. 17, 1992). | 



"Table 2.1.9-1 summarizes basin water flows, withdrawal rights and 

 ins t ream flow rights datafi}r selected salmonid streams in Oregon. " 



This table is not included with the other tables in the back of the report unless it is mis- 

 labeled. 



"Subsequently, McConnaha allocated system survival estimates into 

 individual dam combined turbine and spillway (structural-operational 

 survival, and reservoir survival (non-structural). Individual dam 

 structural survival ranged from 52 to 70 percent for spring chinook and 

 sceelhead juveniles (30 to 48 percent mortality per dam). " 



In this paragraph, the authors attempt to summarize McConnaha' s table, "Data Base for 

 Reservoir Smolt Survival at Snake-Columbia River Projects" which is presented as 

 Table 2.1.9.-2 in this report. The authors incorrectly identify column b, "Estimated 

 System Dam Survival," in the text as "Individual dam structural survival". Hence, the 

 authors report that individual dam survival ranged from 52 to 70 percent, when in fact, 

 McConnaha' s analysis used these estimates to represent combined dam survival for the 

 actual number of dams (5 or 6) present at the time when systems survival data were 

 collected. In his model, McConnaha used estimates of individual dam survival (from 

 0.89 to 0.93, recognizing considerable spill during the test years) to separate out 

 reservoir and dam survival from the observed system survival data. System dam 

 survival is the product of each assumed individual dam survival. 



A-26 



