Interestingly, the Salmon Creek chum had differential stream life. In years of large escapements the stream life was about half that of low escapements (even/odd).

This fish evolved, in the Stilly, with huge pink runs and the Chinook evolved together. In the Cedar, where there were no sockeye (but there were pinks pre-diversion) the Chinook may not have had to deal with the competition.

The Cedar is also benefitting by now having Chinook spawning above Landsburg. The habitat may be better up there.