■ Tributary sites 

 Q Manstem sites 





Biackfoot River and tributary temperatures 



Temperatures studies during 2004 and 2005 involved: 1) baseline and long-term 

 data collections at established sites throughout the Biackfoot watershed; 2) assessing 

 tributary restoration 



projects; 3) identifying 

 thermal regimes (natural 

 and anthropogenic) 



favorable and unfavorable 

 for trout; 4) monitoring 

 temperature triggers of 

 the Biackfoot Emergency 

 Drought Plan; and 5) 

 relating other biological 

 assessments (migrations 

 and spawning) to thermal 

 properties of the river 

 system. Summaries of 

 temperature data are 

 found throughout this 

 report. All raw and 

 summary data for all 

 monitoring sites are 

 located in Appendix H. 



ftelmont 



Figure 7. Temperature monitoring locations in the Biackfoot Watershed, 2004 

 and 2005. 



During 2004 and 2005, we collected 56 water temperature samples at 44 locations 

 in 26 tributaries, along with , 



—»- Cutoff Brdg (rm 70.2) 



• Raymond wdg (rm 58.4) 

 —♦—Scotty Brown Brdg (rm 44.3) 



r^ 



12 samples at six sites in the 



Biackfoot River, including 



four long-term monitoring 



sites (Figure 8, Appendix H). 



Figure 8 shows a portion of 



the river data at these four 



sites for the mid-summer 



(1999 - 2005) period, 



compared to the mean. These 



data show the wide range of 



inter-armual summer 



temperatures for the lower 



-70 miles of the Biackfoot 



River. This includes 



temperatures >70 °F, which 



are generally considered 



above the optimal range of 



most salmonids; temperatures 



> 65 °F are considered harmful to bull trout. 



80 



75 



70 



65 



60 



•Belmont (rm 21.1) 



^ 



\^^^^5 



1998 



>• 



3 



2000 



2001 



= ' 3 



2002 



3 



2003 



2004 



2006 



Mean 

 Max 



Figure 8. Maximum monthly summer (July- August) water 

 temperatures at 4 monitoring sites on the Biackfoot River, 1999-2005. 



21 



