Foundation of? Traditional Cache

Not sure what was here.  At first thought it was a barn and this was a homestead.  But...  too many internal walls, did not find other building foundations near, and with the road leading down to the reservoir to the north, it might be a pumping station for the reservoir.  But, again, I found this, but do not know what it is.  Again, if you do know, add it to your post.

standard blue-top peanut-butter jar. 

You can drive here from the east.  The road starts at the water towers in Swedetown.  The road is passable by cars for around half the way in (or more), but not having owned a low-clearance vehicle for many years, there are a few spots that might be a problem. Drive in as far as you are comfortable. Note: I drove in here with my Jeep Cherokee and never even thought of using 4x4, but was thankful for the clearance. You can also drive in from the west off M203 (just north of the Cloverland Rd intersection), but the last time I did, I thought of using 4x4, but didn't.