When Niagara Waterfall Become Dry

Fr8monkey

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In the world of tomorrow!!
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.

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Link to video.

Link to article
 
My first reaction to the title was that this is alt history and it does not belong here, but I never realised it actually did happen, although it was by design rather than anything untoward happening.
 
The flow of water was stopped completely over both falls
on March 29th 1848 due to an ice jam in the upper river for several hours. This
is the only known time to have occurred. The Falls did not actually freeze
over, but the flow was stopped to the point where people actually walked out
and recovered artifacts from the riverbed!

The tremendous volume of water never stops flowing, However, the falling
water and mist create ice formations along the banks of the falls and river.
This can result in mounds of ice as thick as fifty feet. If the Winter is cold for
long enough, the ice will completely stretch across the river and form what
is known as the "ice bridge". This ice bridge can extend for several miles
down river until it reaches the area known as the lower rapids.


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Read the OP :mischief: Or to actually answer, there were some major rock falls, and they diverted the water to remove some of the fallen rock. But decided that that wasn't a practical idea, so they engineered some reinforcement to the river bed so that the rest of the falls wouldn't collapse.
 
Keep in mind that a huge proportion of the water is diverted to power generators at all times (half during the day in tourist season, else 75%). Even in 1969 quite a large proportion was diverted, so diverting it all isn't that difficult to do.
 
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