I've driven along Dixie Run and I can't believe it was ever a Class A brookie stream in my lifetime. It's channelized from the headwaters down to the mouth at Babb Creek. It may be, but the floods are caused by the channelization not the other way around.
The stream is a wreck constructed by whoever channelized it.
As for Babb, I've don't usually see the water muddy and I've crossed the creek quite a few times going to camp.