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Partial Freezing: The American Falls are more prone to freezing due to shallower water, while the Canadian Horseshoe Falls never completely stop flowing.
The 1848 Freeze: The only recorded time the Falls completely stopped was in March 1848, when an ice jam at the source (Lake Erie) blocked the water for 30 hours.
Ice Bridges: In extreme winters, ice accumulates in the gorge below the falls, creating a massive "ice bridge" that can look like a glacier.
750,000 gallons of water every second
