I had spotted this place in one of my frequent scans of Google Earth, looking for interesting things to check out. There really weren't any clues from the imagery as to what it was, but I could see that there was a path leading to it. It would all come down the the Mk I Eyeball.
We parked on the side of the street and took a quick hike down the trail to find a set of disused railway tracks. I doubled back, following these to where my map indicated that I should turn off into the bush. And there it was.
A significant amount of concrete, and clear signs of it being a popular place to hang out. But still, no clues as to what its purpose had once been.
I did a bit of looking around online and didn't find a great deal. One theory appears to be that this is the site of a fish rendering plant. Other documents suggest it was a lumber mill belonging to the family of Charles Fenerty, but that appears to have actually been located on a neighboring lake. It does, however, appear the family logged throughout this area, so it's difficult to know.
Fenerty himself was an interesting character having apparently been the original inventor of the process for creating paper from wood pulp.