Humans, feral or otherwise would need a pretty fair reason to hang around such places? Not saying it isn't a feral Human child but the depth of the prints make no sense if it is. And also, say it is a 7-9 year old. even running, 47 inch steps do not sound normal, especially when "running" toward a slope as dangerous or possibly life threatening as Northwind has described.
And don't worry, Patterson-Gimlin, I leave doors open for all kinds of answers and my first go-to isn't Sasquatch. Sasquatch is always in a process of elimination. But then that process needs a good deal of grounded scientific common sense to work properly. And sometimes coming up with a Sasquatch as the only answer, at last for me, is worrisome on more than a few levels.