According to the article it was laying in a hole with a funnel of fresh-ground kokanee feeding it - hence it's incredible size and girth.

And yes, we'd rather have large, wild steelhead than super-sized tailwater trout. Heck of a catch anyway especially on light tackle.
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. . . and God said unto them, Be fruitful, and multiply, and have dominion over the fish of the sea . . .