I nearly broke my neck slipping on the ice, on my way down the rivulet past the Female Factory this morning. It's been about 1° overnight. As I got to the top of the zigzag track I could see the river. What was interesting was that I couldn't see the other side at all. There is often a huge solid bank of river fog, with definite edges (called the Bridgewater Jerry). This morning it was thick enough to block out the Eastern Shore, but in such a way that if you had never seen the view before, you might think you were looking out to the open sea.