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I lived in Fall city worked in Issaquah for about 3 years, used to go down to the falls all the time. It was a hatchery fish, can only keep hatcherys. I was fishing for summer runs, usually only a couple people fishing, but usually none. No bait or scent. It was a float and jig show.
There doesn't have to be a hatchery up there for the fish to be there. We catch all kinds of steelhead at the barrier dam on the Cowlitz, even though the hatchery is miles down stream at Blue Creek.