The NPR basins were ranked according to regional patterns of environmental stress for salmon under current and projected future (to 2100) climate conditions. The basin rankings account for the relative abundance and distribution of freshwater habitats in each basin and include dynamic river flow and temperature simulations as indicators of water quality. A salmon stress index was developed based on temperature thresholds for spawning, incubation, and rearing for individual salmon species. The salmon stress ranking was coupled with the sub-watershed physical complexity ranking to develop a watershed vulnerability index for individual salmon species. Chinook and Coho rankings are highlighted below.
