Good point CM about the effect of selective fishing on the rate of return to the hatchery rack. However, that effect operates every year and doesn't explain inter-annual variation. Looking at those graphs, I'm not sure what purpose they serve, especially absent smolt numbers. SAR, by species, by HOR and NOR seem more useful to me. Raw count of summer steelhead back to the Cowlitz would be useful to me, since I'm there during the summer fishing for steelhead and cutthroat.