Dono - Interesting and educational observation. Water temp info will be a good data point.
Bill and others the water temp is bouncing between 38 and 42. The air stations shut down at about 3:30 in the afternoon. Water fall is locked on 24/7 right now with 5500gph going over it.
https://drive.google.com/file/d/0BxzoWm1-8aOuMGxqTXNXanZZQjg/view?usp=sharingCheers Don.