After one more morning of slowly digging through the giant snowbank, the snow canyon was complete. The calves got to go outside without us having to worry about them escaping over the fence, so all was well.
Then, just for fun, we decided to see if we could drive the Cat up on the snowbank. It turns out that we could, almost all the way to the top before it started to spin. In the interest of not spinning down into the snowbank and not being able to get out until July, that is where we stopped trying to climb the snow.