Workshop in the Woods

So last week, like many of us, I was away on vacation. My wife and I took off to the wilds of Algonquin Park for some canoeing and random moose sightings. It was a chance to get away from it all, leave things like work, especially work, behind. I was quite surprised that on the third day into our week-long trip, I ran into something that smacked of my day job. At the start of a 850 m portage from Misty Lake to the Petawawa River, we found a 50€³-diameter saw. I figure it was a remnant of a logging/milling operation. How about you? Any theories as to how this big blade came to intrude on my vacation bliss?