It seems some deep snow pushed up against my pier had retarded ice formation along with a bubbler I'm running about 30 feet away to prevent winter kill. I've also noticed over the years my wooden pier warms up and retards ice formation. Upon close examination I have open water under part of the pier!
What happened was I was checking the ice off the pier with one of my boots and suddenly I'm in!
Surprisingly once my jacket and clothes became waterlogged, the pier wasn't much help in getting out as it's up above the ice level somewhat, and I had to roll my self up on the ice before getting up on the pier. I had the dog on a lease and she was standing on the pier looking at me like, "what in the hell are you dong in the water!?"
After losing one boot to the pond bottom I took one off and made a mad dash to the house through the snow. Cooooooold!
So be careful out there. Deep snow can be quite an insulator regardless of how cold it gets. The rest of my pond has a solid 6 to 7 inches of ice although the snow on top has melted.