Salmon question

EBT

Smolt
Walking along the Willamette River last week, I saw a dead salmon, 16-18" or so; couldn't identify it for sure, but maybe a chinook jack. This was about 10 river miles north of Salem. The water temperature in that area is much better suited for bass, perch, crappie, etc this time of year. Can anybody provide a likely explanation for that salmon's presence? I'm fairly new to Oregon, so have not yet locked in on the run timing of various species of salmon.
 
Summer Chinook jack if I had to guess. Too early for fall and almost too late for spring but there are outliers everywhere and a jack is susceptible to being one.

Could be a plethora of reasons for its death without knowing more.
 
I would guess a spring Chinook jack. The Willamette has a large run of spring Chinook and no summer Chinook that I'm aware of. A springer in poor health could have drifted downriver and died. That is not uncommon at all.
 
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