I don't know what the minimum viable population would be for Susquatch/Yeti/BIgfoot but let's just assume it's just 100 individuals necessary to protect genetic diversity. That's 100 living in and around wherever you were in Alaska when you had your experience. According to this web site - http://www.bfro.net/gdb/ - there have been 22 credible sightings in Alaska of late. If we assume that only half of them represent different areas, then there's around 1,000 individual Susquatch in Alaska. But every state has had sightings and using our formula, California is home to some 20,000 individuals, Washington State is home to 30,000. Nationwide, we're talking hundreds of thousands; worldwide, millions. And so, over the millenia, tens of millions of these creatures have lived, and died.
Museums should be filled with their bones. But not one single solitary piece of physical evidence has ever been found to demonstrate that this is an unknown species. Not a single bone from all of those dead individuals. And as for the live ones, not one pile of dung, not so much as a single hair has been found which genetically proves their existance. No one has ever shot one, or trapped one, or run over one, or been killed by one.
In short, there is not a shred of evidece that they exist. Nada. And it is impossible for that to be the case if they do exist.