The Streams and Rivers Condition Index is a broad ecological system index that classifies the landscape’s streams and river catchments into condition categories. The classification of the landscape in this manner is used to measure the relative departure of current wildlife habitat conditions from desired conditions as defined by parcel-level wildlife managers and landscape planners. The purpose of the index is to help practitioners determine appropriate next actions in each catchment, especially when used in conjunction with relevant species information. There are four condition categories, or classes, which range from the most ideal habitat conditions to the least ideal habitat conditions.