It goes down no?
In: Earth Science
It will eventually run out, as the Great Lakes’ watershed is only like 1% renewed annually… but the Great Lakes (Superior, Huron, Michigan and Erie) that feed the Niagara River are absolutely massive. I believe they hold close to a quarter of the entire planet’s freshwater.
If flow rates over the falls stay the same (which they do control, monitor and limit very closely now to ensure diversion to power generation/utility consumption is fair and not drying it up), part of the falls could disappear in 2,000years. Even if these falls have a never ending source of water, the other thing is that the falls’ location is eroding further upstream over time. Although man made intervention could slow this down, the forces of erosion are pretty constant and it will eventually run it all the way back to Lake Erie (in ~50,000years) to turn it into more of a series of rapids versus the massive falls that exist today.
Found most of this info here:
https://www.niagaraparks.com/visit-niagara-parks/plan-your-visit/niagara-falls-geology-facts-figures/
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