Table 5« =— = Correlation between adult and yoimg populations 



In 19li7, the anomaly from the correlation is probably due to the 

 late rainfall during the downstream movement (spring of 19li8 actually) 

 which caused a greater- than-normal survival rate in these young fish. 

 Irrigation did not start until well into May, a time at which the bulk 

 of the migrants have passed into the Sacramento River. Hence, losses 

 in irrigation diversions were substantially reduced. Also, the number 

 of fall-run salmon in 19li7 was greater than usual in Deer Creek because 

 of early fall rains. This would also tend to increase the niimber of young 

 migrants in the fyke-net catches. 



The peak downstream movement of young salmon has always occurred in 

 either March or April, usually in March. Lethal water temperatures are 

 not normally present until the early part of June, and it is presumed that 

 losses of young salmon from excessive temperatures are negligible. 



Stream Temperatures 



In April of 19ii7, a thermograph was installed on Deer Creek near the 

 •station and continuous daily recordings of water temperatures were made 

 subsequently. Before that date, temperatures were taken by a hand ther- 

 mometer at various times at the weir site, in the canyon, and on the upper 

 reaches of the stream. 



On July 3, 19^^!, a thermograph was installed at Campbellville. It 

 remained there until October 22, 19hl^ Maximum temperatures were recorded 

 each day about h p.m. They ranged from hQ° F. to 70° F. In upper Deer 

 Creek from the Lower Falls to Polk Springs during this time, the water 

 temperature ranged from k3° F. to 67° F. In the area between Polk Springs 

 and Carapbellvillej, the range was Uio F. to 70° F,, and below Campbellville 

 to the Deer Creek Irrigation Company Dam at the mouth of the canyon, it was 

 1x8° F. to 77° F. 



