Passage indices of juveniles at selected dams, 1984-94. Arrows indicate years of dam completion. Transport to control ratios are averages for species and release dam by year for values summarized in Mundy et al. 1994. The dotted line indicates equal survival of transported and control groups. Locations of squawfish sport reward fishery registration stations in 1995.
Black bars indicate a decrease in the number of spawners.
Black bars indicate a decrease in the number of adults returning to the hatcheries. Generalized ocean migration patterns for steelhead. Generalized ocean migration patterns for chinook. Generalized ocean migration patterns for coho. Average summer and spring spills expressed as percentage of total flow for the mainstem dams between the Columbia River mouth and Idaho spawning grounds.