Minimum Numbers of Salmon and Steelhead Entering the Columbia River, 1938-1994, and Commercial Landings of Salmon and Steelhead from the Columbia River. Total hatchery rack returns above and below Bonneville Dam. Data from the 1960's and 1970's is incomplete for some hatcheries. Total hatchery rack returns by species and run. 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.