This project will attempt to deduce whether or not the Animas River is adversely affected by passing through the town of Durango, Colorado. In addition to analyzing two data sets provided by the Animas River Stakeholders Group, one including physical and chemical water quality indicators and the latter biological indicators through analysis of macroinvertebrates present at various sites, this report will also outline some important elements of water quality and provide descriptions of the various components associated with assessing water quality.