Six foot is pretty shallow....extended snow cover on the ice is your enemy, not so much the ice itself. You need sunlight to get down to depth and stimulate plant growth, providing O2.. I don't see any aeration in your photos, which is a great method of keeping an area ice-free. If it freezes thick enough, perhaps you could clear some of the snow off by hand...CAREFULLY.
Temps wise, the 10' deep area might provide refuge, depending on the number of fish present....
