The 'unprecedented' amounts of ice in the upper Niagara River, caused by the freezing conditions,caused a so-called ice jam and in turn flooding on Grand Island and Cayuga Island in Niagara Falls.
According to historical records, during only one year, 1848, has freezing weather caused the thousands of cubic feet of water per second flowing over the Niagara Falls to run dry,an event thought to have been caused by ice jamming and damming upriver,according to Ice bridges spanning the Niagara River from bank to bank have formed as a result of various other chilly winters. In 1936, the American Falls,the shallower of the three waterfalls, are said to have frozen over completely.
In 1912, an ice bridge broke apart as several people were crossing it, sending three to their deaths.