Ewest, we've sort of "struggled" with the bottom water temps ever since we started some winter monitoring several years ago, including Dwight's great work. Even in hill ponds, we're seeing 40-41 rather than 39. Ground water influence? Maybe some type of solar heating/radiation effect along the sides and bottoms? I assume that physics has not changed and 39 is still most dense. Another one of those "surprises" that we find when we translate from accepted knowledge to actually taking a look.
