Barbara,
Any way you can get some diffuser aeration going at all in winter? No power available? That would allow you a safety net. All you would need is a very small compressor and a diffuser set in 2 to 3 feet of water to keep a hole open. Even if you did super chill the water the trout don't mind vs. warmwater fish. You could get by with a small compressor as the DC22 on this page:
http://www.stoneycreekequip.com/form/air_compressor.htm I use it on my trout pond in winter.
I'm not pusing this company as there are other compressors etc. on the market, and we do have a few folks on here that sell them and are experts on them.
I do know some people in Co use solar powered diffusers too for their trout ponds. Maybe something to look into.
