I went to view the falls, specifically hoping to find them frozen, and was not disappointed. The temps were just above freezing and it was a sunny day, so there was a lot of water flowing under the ice, making kind of a hypnotic visual and auditory experience; and the ice makes for its own nice pictures. However, I found four things of note for the hiking experience. First, while the hike isn't technically challenging, there is a lot of walking on non-level ground like boulders, so hiking boots are a good idea for ankle support. Second, as noted by others, this is a wet weather waterfall, so I'd recommend wearing a different pair of shoes and changing into the hiking boots just for the hike as they are quite likely to get muddy if the falls are running. Third, during the winter (as I experienced), there can be sloped ice patches leaning toward ledges overlooking 20-30 foot drops, so extra caution is recommended. Fourth, the trail markers point hikers looking for Mina Sauk falls toward the upper falls, which I estimate are about 25 feet tall...very pretty, but not particularly high; if you hike further down toward Devil's Tollgate (not particularly impressive itself for anyone other than a geologist), there is a much larger waterfall about 1/4 mile below the noted falls.