In the late 1980's, the National Park Service (NPS) began an intensive program to monitor water quality and invertebrate community structure in prairie streams at several midwestern parks (Harris et al. 1991). Included in this baseline study was George Washington Carver National Monument (GWCA). Based on the study of Harris et al. (1991), a preliminary protocol was suggested by Peterson (1996), in which data dating back to 1988 and collected under the guidance described in Boyle et al. (1990) were analyzed.