Ecology has served as the Principal Ecologist and Project Manager for the Santa Barbara Streams and Estuaries Bioassessment Program since its inception in 2000. The Program is a long-term effort funded by both the County of Santa Barbara and City of Santa Barbara to monitor the biological integrity of streams and estuaries in Santa Barbara County, and evaluate the effectiveness of ongoing efforts to improve water quality and restore stream and estuary habitats. Ecology has worked closely with the County and City over the years to develop and refine the Program design and scope, which involves the collection of physiochemical and biological data including benthic macroinvertebrate (BMI) samples from 30 to 40 streams and estuaries each year using rapid bioassessment protocols. BMI samples are analyzed in our laboratory to determine the taxonomy and abundance of the BMIs collected, and numerous BMI community “core metrics” relating to taxonomic diversity, disturbance sensitivity, and trophic structure. Core metric values are is used to provide a score of biological integrity for each study site using the Indexes of Biotic Integrity (IBIs) that Ecology created specifically for Santa Barbara streams and estuaries. By translating complex BMI data into an easily understood score of biological integrity, the IBI serves as a powerful tool for communicating the ecological status of local streams and estuaries, and an important basis of watershed management decisions.