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It doesn't take -20°C to form ice near waterfalls or freeze curtains of water, though perhaps it takes that to freeze fast-flowing falls entirely. See this Blog entry from which these pictures were taken: Temperatures around that time:


There's a distinction here between ice formations and actual frozen waterfalls. A large percentage of the ice formations you'll see (including your 1st picture) aren't actual running waterfalls, but cliffs or steep gullies that in the summer would just appear damp and mossy. The "low" volume of water can still be enough to freeze into large formations. They ...


The closest I have seen to that was after 9 days of -20C (-4F) temperatures, which also froze the surface of some large rivers here in Scotland. Warmer than that and the ice doesn't seem to grow - if the flow rate is too great I guess there isn't the time for crystals to form before they are washed further downstream.


Not an exact answer, but besides freezing temperatures you should also take into account the duration of frost. Ice needs some time to grow and develop. I would say common sense also suggests that the bigger the stream of water, the longer it will take for the waterfall to freeze. You'll be better of looking for slow flowing creeks with a low volume of water,...


It's not at all too much for 2 weeks, even without rushing. I've done a couple trips from St. Louis out to CA this way. You're asking the right question, IMHO. Make a list of the must-see locations, and fill in with stuff you happen by. I have two sons and did one trip with each like this. Tent-camp a day or two, motel stays on the nights in between. We ...

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