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This publication contains habitat models constructed and information compiled for two distinctly different purposes. The Habitat Suitability Index (HSI) model by Raleigh and Miller contains 17 habitat variables for chinook salmon by life stage. The HSI model provides an objective quantifiable method of assessing the existing habitat conditions for chinook salmon within a study area by measuring how well each habitat variable meets the habitat requirements of the species by life stage. The model thus provides an objective basis for predicting probable project impacts, documenting post project impacts, and guiding habitat protection, mitigation, enhancement, and management decisions. The section by Nelson contains habitat criteria curves for five flows-related variables for use in the Instream Flow Incremental Methodology (IFIM) (Bovee 1982; Milhouse et al. 1984). The IFIM model is intended to provide an objective method of assessing the effects of changes in water flow on habitat of chinook salmon by life stage. The HSI model is presented first followed by the IFIM section. Comments on model assumptions or performance, should be addressed to the appropriate author of each section. A brief overview of the HSI modeling procedures and IFIM curves follow.