Kleinschmidt Creek. Kleinschmidt Creek also supported a few abnormal diatom cells 

 and had a slightly elevated disturbance index (% Achnanthidium mimitissimum), which indicates 

 minor stress that may be natural in origin. 



Yourname Creek. This site had a depressed pollution index and an elevated siltation 

 index, which indicate minor impairment from organic loading and sedimentation, respectively. 

 Three teratological diatom cells were counted here. 



Richmond Creek. This stream had an elevated siltation index and supported the largest 

 percentage of abnormal diatoms (1 .74%) of all the Blackfoot tributaries. However, both values 

 suggest only minor impairment and full support of aquatic life uses. 



West Fork Clearwater River. The upper site had a slightly elevated siltation index and 

 supported the second largest percentage of abnormal diatoms (1.19%). Both values indicate only 

 minor impairment and full support of aquatic life uses. Diatom metrics at the lower site indicate 

 excellent biological integrity and no impairment of aquatic life uses. The similarity index 

 indicates that a moderate amount of envirormiental change occurred between the two sites. 



Deer Creek, The upper site had a slightly elevated siltation index that indicates minor 

 impairment from sedimentation. Judging from the depressed pollution index and the large 

 percentage of the eutraphentic species Melosira varians, the lower site suffered minor 

 impairment from excess organic loading and elevated concentrations of inorganic nutrients. The 

 similarity index between the two sites suggests that a moderate amount of environmental change 

 occurred between them. 



Blanchard Creek. A large percentage of highly motile diatoms at this site, including 

 Nitzschia fonticola, suggest moderate impairment and only partial support of aquatic life uses 

 due to excessive sedimentation. Blanchard Creek also had lower diatom species richness and 

 diversity values than most other sites in the sample set, and the pollution index was just above 

 the threshold for minor impairment. 



11 



