I saw bigfoot, once, but that was before I quit drinking, he was riding the Loch Ness monster down the Nisqually, and apparently had a limit of 40-lb. kings with him...
Seriously, It is ulikely that a large (primate?) could live in the forests around here. There's actually quite alimited supply of food in the deep forest. And, as has been pointed out, there are no cedible hair or bone samples, no identifiable Bigfoot poop, no bones or bodies.
Who knows what the supposed eyewitnesses saw. Certainly some credible people have claimed sightings, and probably saw something, but what? My dad once mistook a black bear for an angus in low light and in a place he didn't expect a bear to be. Not to say there can't be bigfoot, just that it's unlikely.
Having said that, I spent a night on Squaw Mountain by Estacada, Oregon wondering what the hell was trolling the perimeter of my camp and making so much noise on a moonless night when I was a teen on a hiking trip, no booze involved. Probably elk, but why would an elk cirlce a clearing with two people and a dying campfire? You'd be amazed how far down into a sleeping bag you can crawl...