In response to a need for Columbia Basin wide evaluation of anadromous production potential during the Northwest Power Planning Council's Subbasin Planning Process, two work groups, the System Planning Group (SPG) and the Monitoring and Evaluation Group (MEG) developed the Smolt Density Model (SDM). The primary output of this model was an estimate of smolt carrying capacity by subbasin and stock which was used in the Council's System Planning Model (SPM). The SPM was a life cycle model used to predict effects on salmon and steelhead due to various strategies proposed by the planners. This model also provided an updated distribution dataset, along with a subjective habitat rating by species/run. Complete SDM documentation is available here (pdf format). More technical information is available for this data category's database structure.