Could you slide down a frozen Niagara Falls ice sheet? In theory, perhaps, but in reality, it's not a feat recommended for the faint-hearted – or, indeed, for anyone.
While it may be a fun idea for adventure-seekers, sledding down a frozen Niagara Falls ice sheet is fraught with dangers and uncertainties that would likely end in disaster. For starters, despite frigid winter temperatures, the powerful water flow from Lake Erie into the Niagara River never truly freezes solid.
In extremely cold conditions, an ice bridge may form at the base of the falls due to accumulated ice. Even so, the solidity and stability of this ice sheet are unpredictable and it remains in constant motion due to the intense flow of the river.
Also, given the height of the Falls - the Horseshoe Falls drop about 188 feet (57 meters) - the downward slope is incredibly steep. Coupled with an ice surface that's smooth and slippery, any uncontrollable sled would rapidly accelerate to perilous speeds.
Another significant consideration is the legality of such an act. Both Canadian and American park services are unlikely to approve any such endeavor due to the evident dangers involved. People have been fined or even imprisoned for attempting daredevil stunts over Niagara Falls in the past.
Remember the infamous ice bridge disaster in 1912? Three people died when the ice bridge unexpectedly broke loose from its shores. So, since then, officials have gone to great lengths to ensure no one is put in a similar position of danger again. Walking or playing on the ice bridge at the Falls is strictly forbidden and attempts to sled down a frozen Niagara Falls would be dealt with severely.
So while the idea might be tantalizing for adrenaline junkies, we'd strongly recommend visiting the Niagara Parks (on either the USA or Canadian side of the border) in a safe, responsible manner, where there are plenty of exciting, legal adventures to be had. Stay warm and take in the stunning views from the safe viewpoints provided by the park!