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Washington Sport Fishing Rules

Go to Page 8

Salmon, here it explains what a "jack is", then anything larger is a Adult.

Now for steelhead, nothing about "size" to be an adult, that does surprise me. Must be any steelhead caught, with adipose missing, can be retained.
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"Worse day sport fishing, still better than the best day working"

"I thought growing older, would take longer"