From Waterfall to Icefall

I just did this one for fun. The two pictures were taken about a month apart, but I think it took less time for the waterfall to actually freeze. But you can see that the flow of waterfall was pretty small at the time, and just accumulated. It seems to start off from the walls and floor and grow outward. You can also see the green moss and algae turn brown. These things interest me anyway...

-Starved Rock, IL