Thanks for the info Pappie, that chart on dissolved oxygen is good info., its was last Dec since I've been down that way, tryed My luck at Fly fishing for trout during the delayed harvest season and at that time it was hard to find a thawed stream to fish and I quickly decided I was getting to old for tent camping when it was 20 degrees out, lol. I will plan on Cave run in Sept or Oct, My buddy needs to request vaca time.