Niagara Falls is made up of three waterfalls from the Niagara River. In 1969, the US Army Corps of Engineers stopped the flow of water over one of them, American Falls, to study the stability of the rock underneath. For six months, tourists could walk over the rock bed where the falls had been. Ultimately, the Corps decided that stabilizing the rock bed would not be worth the expense.
Link -via the Presurfer
(Image credit: Flickr user Russ Glasson)
Previously: The falls also stopped flowing in 1848 for natural reasons, and froze completely over in 1911.
Yes, it certainly would hurt... if you survived the fall.
Stupid stupid stupid.
On the other hand, cool photo.
To put their 'horror' into perspective geologically, the Niagara River had many ancient rapid erosion events (The river eating up hundreds or thousands of feet of river bed in days or weeks. If you ever go there, you'll see how that can be possible.)
And if I'm mentioning that, I have to mention this amazing account of the kid who went over the Canadian side in a lifejacket in 1960 and lived: http://edoerksen.blogspot.com/2010/07/miracle-of-niagara-falls-50-years-ago.html
I also looked up the amount of water involved, 90% of the water flows over the horseshoe side, since they did this in the winter and since the difference between summer time peak volume and winter time low volume is so huge, diverting the American side water would be negligible.
Guess I'll keep wondering.
It seems that diversion of the water flowing through the American channel wasn't terribly difficult.