Wild Trout - Interior Columbia Basin

Conservation Success Index:
Wild Trout – Interior Columbia River Basin

The CSI – as originally developed - is an aggregate index comprised of four different component groups: Range-wide Condition; Population Integrity; Habitat Integrity; and Future Security.  Each CSI group has five indicators that describe a specific component of each group.  Each indicator is scored from 1 to 5 for each subwatershed, with a score of 1 indicating poor condition and a score of 5 indicating good condition. Indicator scores are then added to obtain the subwatershed condition for a Group, and Group scores are added for a CSI score for a subwatershed.  CSI scores can then be summarized to obtain the general range of conditions within the historical or current distribution of the species.

For the Wild Trout application the original CSI has been modified by only including the Habitat Integrity and Future Security indicators, thus resulting in total scores ranging from 10 (low) to 50 (high).  Basic information on potential trout habitat suitability and native trout populations is also summarized, although it is not formally incorporated into a group of indicators and scored.