temperatures significantly lower during winter months, and conditions more favorable to 

 anchor ice formation (Figure 51). 



Kleinschmidt and Nevada Spring Creeks had winter temperatures that averaged 

 near 43" and 45"F during winter months, and were warmer than other current bull trout 

 spawning sites. When comparing these two sites, Nevada Spring Creek temperatures 

 were more consistent and lluctuated 1" F or less during winter months. 



Although we assessed only one aspect (winter surface water temperatures) of 

 spawning habitat, results provide some insight in to a discrete and critical component of 

 bull trout spawning sites. In the future, we hope to expand these types of winter 

 temperature studies to the intra-gravel environment of current and suspect historical 

 spawning sites, kicorporating more specific geomorphic assessments to further define 

 areas where expansion of bull trout to historical spawning sites may also be possible. 



Kleinschmidt Creek Temperature Regime 



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Nevada Spring Creelt Temperature Regime 



50 -r 



45 



40 - 



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xy <b^^ ^^ /& .^ # ^^ ^ # ,N*^ ><5* \<y <b^^ \<» \T> vN^^ # .(?> fl^' 



Figure 50. Winter water temperatures at two suspected historical bull trout spawning 

 sites, winter 2002 and 2003. 



81 



