Framework / Assessment Criteria and Indicators of Sustainable Rangeland Management Summary This indicator measures the extent and condition of riparian plant communities along rivers and streams on rangelands. The status or condition may be evaluated on a quantitative basis using a numeric value. Possible numeric values could include a metric similar to the Index of Biotic Integrity (IBI), a hydrogeomorphic (HGM) index, or a qualitative evaluation with a descriptor such as “fair condition”.