George Byron was so impressed with this waterfall that he mentions it in his poem "Childe Harold's Pilgrimage," and a replica of his cape and book remain in a memorial to the great poet.
Visitors today need to be sure to come at the right time. We stopped briefly just before 10am to check out the waterfall, with our guide telling us that he had not been here, but he knew that there were three drops. Of course he meant three separate waterfalls. (I counted four, but that's okay). They are on three levels; the bottom level seems to have two falls, but that may be because of the time of day.
We were not there when the hydroelectric plant, just upstream, was open, and there was limited water flowing over the edge. Indeed, this beautiful waterfall in a beautiful setting was only a trickle. Evidently they open the gates at noon every day, and it is very impressive. It was pretty, but there was not much water. We got postcards with pictures of the falls at their peak, as well as some pretty pictures of them with a trickle running through. And we left with a great joke about the "three drops," because that was what we saw.
It was a great stop though, with a few interesting stops and some great public restrooms (very important in Italy) at a good stopping point between Rome and Spoleto.
There is a ticket and a charge (about 6€) to see the waterfalls, but at 10am, no one was taking tickets.