Niagara Falls ran dry: Photos show moment iconic waterfall came to standstilll - http://www.dailymail.co.uk/news...
"It's taken 41 years, but a previously unseen set of photos of the mighty Niagara Falls reduced to nothing more than a barren cliff-top have finally surfaced. The stark images reveal North America's iconic - and most powerful - waterfall to be almost as dry as a desert. In June 1969, U.S. engineers diverted the flow of the Niagara River away from the American side of the falls for several months." - Paul Buchheit
And THAT is why you don't want to fall off the side. - Eric - Final Countdown
Doesn't it freeze up in the winter some times? - Gabe
Gabe: it can't freeze due to the amount of water flowing, but there have been mitigating factors in the past (like ice dams forming upstream) that have created walkable parts. Trivia: they control the precise amount of water that flows over the falls, and throttle it back at night for hydropower. - Mark Trapp
Wow looks like Super 8 footage - Rodfather
Mark: Apparently ice dams can stop water flow altogether, but it hasn't happened since maybe 1848. What happens is that ice ends up covering the river and the falls (such that you were allowed to walk on it up to about 100 years ago), but the water still flows underneath it. - Gabe