Welcome Natureboy and thanks Cary for all the good aeration input. All the winter aeration threads I recall are wrt fish survival. I can find them if you like. At 3 feet deep in Minn. I would think the pond would freeze solid. Here is one.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=12;t=000044

On the DW/WM issue if there is any left get it out with a net or however. Some types can double in vol. every 24 hrs.