I have only fished the niangua below Bennett seriously for about 3 years, so I don't have that timeline that you guys may have. In my limited experience, I haven't seen any change, except my experience in making it easier to locate the trout. I have always had, and still do, have a catch rate of about 1 trout per hour on the river. I never fish the park, and only go to Taney about every other year. The Niangua, to me, is closest to a "wild" fishing experience I can get here, even though they are stocked fish.