Stephen Kropp
5/14/99 DRAFT
Overview
Holding all other variables constant, the effects of spill on both direct dam mortality and reservoir mortality in yearling chinook are considered. Spill may often enhance juvenile passage, but can also lead to an increase in dissolved gas concentrations in downstream reservoirs. High levels of dissolved nitrogen are known to be harmful to chinook. Whether the combined effects result in a net increase or decrease in survival through various projects depends on how high spill is adjusted during the period of downstream migration.