11 000 years ago, the falls were almost 11 river-kilometers downstream from where they are now, as the falls began where the gorge now ends: at the Niagara Esca

11 000 years ago, the falls were almost 11 river-kilometers downstream from where they are now, as the falls began where the gorge now ends: at the Niagara Escarpment. However, in the last 200 years as the falls became both a societal tourist attraction and a site of hydroelectric power generation, humans have elected to try to make the falls frozen in time as much as it's feasible for them to do so. Due to the diversion of water and various anti-erosion projects, the rate of erosion is now less than a third of what it was before 1905.