What year did Niagra Falls freeze over?

Question

According to rumor,it is undetermined see link:http://www.snopes.com/photos/natural/niagarafalls.asp
Anybody know?

Answer 1

. One question you may be asking yourself is do the Falls freeze over the winter? This question has no clear answer. The falling water and mist from the Falls can create ice formations along the banks of the Falls and Niagara River, resulting in enormous deposits of ice. If the temperatures are cold for a long enough time, the ice will cover the river creating what is known as an “ice bridge,” This ice bridge is capable of extending several miles down river to the lower rapids. Only once in recorded history has the flow of water completely stopped for both falls. On March 29th 1848 an ice jam up-river caused the Niagara River to stop flowing for several hours. Although the falls did not actually freeze over, the flow of water was minimized to the point where people could walk out on the River bottom and collect artifacts. The cause of this ice jam was a combination of a severe winter and a north westerly wind. Only after a change in the direction of the wind to the east did the ice jam loosen.

Answer 2

1911

Answer 3

1989.