just thinking about ice issues, you might consider installing an elec. pump, multiple station bottom air diffuser as opposed to a windmill. looks like your house is close enough, you could keep pump unit near house (protected from elements) and run airlines to lake, then not have to worry about non-windy cold days, and keep more of lake thawed.
I wonder how otters, beavers, and muskrats would react around operating diffusers....scared enough to drive them off, or just a new feature to play around?
