Things you don't think about happen behind the scene to prepare for the season at the Niagara Falls.  Niagara Parks staffers will scale the gorge wall to free up loose rocks that cause Ice Jacking. It's quite the undertaking, that requires Niagara Park staff to wear helmets and protective gear, while doing so. During the winter, water captured in the crevasses of the rocks freezes and thaws over long periods of time and creates loose rocks.

I'd probably list this as one of those jobs I'd never want to have.