The Effect of Timber Management on Stream Water Quality 



40n 



30 





20 



10 



TP 



NO to LOW ACTIVITY 

 MODERATE ACTIVFTY 

 HIGHACTIVriY 



r 40 



30 



-20 



10 



'-o 



600 



500 



400 



300 



O) 



=1 



200 



100 



TPN 



NO to LOW ACTIVITY 

 MODERATE ACTIVITY 

 HIGH ACTIVITY 



600 



500 



-400 



300 



200 



-100 



1^ Figure C-1. Annual maximum total phosphorus (TP) and lota! persulfate nitrogen (TPN) at each often 



paired watershed sites. Site pairs appear as directly comparable sites with different levels of timber manage- 

 ment activity in the watershed. 



Page 46 



Flathead Basin Cooperative Program Final Report 



