I fish the Niangua from Bennett to Barclay every spring for a 3-4 day trip. About every 2 to 3 years we get into a few nice browns. Not trophies, but nice fish, and they come in bunches. 4 years ago, middle of the day in May with blue bird skies, our group caught two nice ones within 20 minutes just below NRO on rebel craws. One was 19 inches, the other 17. Two years ago, there was an overnight storm that blew out the river such that we couldnt fish it. Went to Barclay and threw around the canoe lagoon and caught 5 browns over 15 (none bigger than 17) in an hour. Caught on rebel craws and big woolies. I think there are more decent browns than most think, but they are savy. As for as trophy fish, I think it is more like musky fishing - the fish of 10,000 casts.