Here is how the pond (built in the old silo foundation) looks this spring. Last November Rog built this greenhouse surround and we wrapped it in plastic to help conserve the heat and add heat with the greenhouse effect. It was a really cold winter, however, and the water froze very deep - we were delightfully surprised when it melted and we discovered the hundred or two goldfish (and a bunch of leopard frogs) had survived. A few weeks ago I unwrapped the plastic from the sides.
You can read more details about the technical aspects of this project on Chris's "Fresh With Edge" website and blog.