Bruce :

Thanks for the offer but I have one located and will use it soon. It took a while to find what I wanted. We do get 39 degree water and it sinks just not enough to keep it that cold as we then get 50-60 degree days which warm it up. With the back and forth temps. and wind effects we get lots of mixing. While I have not measured the temps. in Jan. yet (I will this winter)I suspect that temps will be around 39-40 at all depths with swings at the surface based on current weather. The ponds have been covered with ice up to 1.5 inches before.