I did not see anything about cattle in your original post, if cattle are present or have been I would guess lack of suitable spawning habitat. Nait said something about silt, bingo. Cattle can introduce a pile of silt to a creek, especially one that doesn't flood, wading can help spread the silt through the entire creek. May be that the browns need a top up stocking time to time, my understanding is the brookies head way up to clear bottom to spawn, maybe they are the more successful spawners.
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“One of the sad signs of our times is that we have demonized those who produce, subsidized those who refuse to produce, and canonized those who complain.”
Thomas Sowell
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