 The years 1885, 1902, 1906, 1911, 1932, 1936, 2014, 2017 and 2019 are noted for partial freezing of the falls.A so-called ice bridge was also common in certain years at the base of the falls and was used by people who wanted to cross the river before bridges had been built.During some winters, the ice sheet was as thick as 40 feet (12m) to 100 feet (30m) but that thickness has not occurred since 1954.