This is how the falls are described in Wikipedia:
The falls are located on the High Rhine between the municipalities of Neuhausen am Rheinfall and Laufen-Uhwiesen, near the town of Schaffhausen in northern Switzerland, between the cantons of Schaffhausen and Zürich. They are 150 m (450 ft) wide and 23 m (75 ft) high. In the winter months, the average water flow is 250 m³/s, while in the summer, the average water flow is 700 m³/s. The highest flow ever measured was 1,250 m³/s in 1965; and the lowest, 95 m³/s in 1921.
The falls cannot be climbed by fish, except by eels that are able to worm their way up over the rocks.
I mention the falls here because one the most recent photographs I have of my son, Stephen, was taken last week when he, his sister and his partner, Sonja, visited the falls.