The resulting data are analyzed using four indices or metrics, and the indices are plotted on a common scale to provide a biological profile. Regardless of their placement, they have seen increasing use since their development, for the process of defining significant biological impairment. The overall biological water quality assessment is computed using an average of the four metric values, normalized on a common zero to ten scale of water quality. Each metric measures a different aspect of the community and contributes a different piece of information to the final assessment. Macroinvertebrate community is diverse with several major groups present.
Most species are intolerant or facultative.
Water quality is not limiting to fish survival or propagation. Macroinvertebrate species richness is lower than found at non-impacted sites. The fauna are composed mostly of facultative organisms. Water quality is usually not limiting to fish survival, but may be limiting to fish propagation. Macroinvertebrate species richness is restricted.