1990 Grayling Spawning Report 



(cfs) 



D 4000 

 I 

 S 



c 



H 3000 



A 



R 



G 



c 2000 



1000 - 



TEMPERATURE 



Daily Mean_^''-> 



DISCHARGE 



Gr Spawn 



Max 



Min 



25 

 20 



I- 15 

 10 



h 6 



E 

 M 

 P 

 E 

 R 

 A 

 T 



(C) 



1 1 1 1 1 II 1 1 1 1 1 1 ii 1 1 1 1 1 1 1 1 II 1 1 1 1 11 1 1 1 1 1 II 1 1 1 1 II 1 1 1 II 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

 Apr 1 Apr 16 May 1 May 16 May 31 June 15 



Figure 2. Daily discharge (cfs) and mean, minimum, and maximum water 

 temperatures in the Big Hole River near Wisdom, Montana from 

 May through July 1989. Preliminary data collected by the 

 USGS. Timing of grayling spawning cross-hatch bar. 



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