The stream IBI integrates information from individual, population, community, and ecosystem levels into a single ecologically based index of water resource quality (Karr, 1981). The IBI is a numerical index that is comprised of various measures of the biological community (called metrics) that are assigned a score (typically 0-10) based on their deviation from reference and summed to provide an integrative expression of site condition. It has been used to express the condition of fish, macroinvertebrate, algal, and terrestrial assemblages throughout the U.S. and in each of five major continents. (http://www.pca.state.mn.us/index.php/view-document.html?gid=21164)

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