I think I finally have part of the mystery solved for the location you are speaking of. I was aware of this "thing" for quite some time but I wanted to gather some more information before I really said anything.
Upon my first visit to the cemetery back in 1996 I came across this area and I, as I'm sure many others, found it a bit odd. For a few moments I thought it had something to do with water because it looked a bit familiar to some other structures I had seen in the past. I'm a bit of a relic hunter but to make a long story short it looked like a place where people would fill water for various reasons such as washing clothes. It would be the base to something that would have been primarily made of wood. Being made of wood makes it a lot harder to verify since that would be long gone for obvious reasons. Of course thinking all of this this made it even more strange because it is next to a cemetery. But the story continues....
After walking around this structure for a while a friend and I had the privilege of finding a small round metal plate with a date on it. It had a date around the mid to late 1800s on it. This metal plate looked to also have something to do with water but I haven't been able to investigate it much further. I plan on posting a photograph of this plate but keep in mind that it would be from video footage, not 35mm, so it's not super clear. But it can still be read. We were both very dumb at the time and didn't take it home which is another issue I will bring up at a later date. But again, the story continues....
A few weeks ago, when the weather was unusually warm, I headed out to the cemetery with a piece of surveying equipment used by utility companies such as gas and water. It is basically a metal detector but very precise and is designed to locate things such as underground pipes. Much the same way you find people looking for underground lines and pipes and putting a little flag in the ground to mark the location.
I was more or less just playing around with this equipment as I was curious if I could detect any graves underground inside the cemetery. After about 3-4 hours of getting used to detecting certain areas and knowing if I was detecting a grave or simply "junk" I came upon the idea of checking out a theory.
I have spoken to many visitors at the cemetery over the years and it appears that most people think that the area where this structure is located is a burial site or has something to do with burials. So I suppose if you happen to agree with that position then this should interest you.... I got fairly good at detecting quite a few (not all) of the burials inside the cemetery. While sweeping the area outside the cemetery I had "0" indication that there was any grave, or at least one that would have had any metal whatsoever to detect. But I was able to detect small objects of very little significance. There was, however, one area where the equipment was pegged very high.... It was the largest signal I detected the entire day there. Being extremely curious I took about an hour of sweeping this particular area with very bizarre results. So after I was certain that what ever I was detecting was less than a foot underground I decided to dig (please keep in mind this was OUTSIDE of the cemetery).
So it was less than a foot of digging when I found what was creating such a large signal. It was a pipe. A very OLD and large pipe. At least large compared to what we are used to seeing such as water pipes in the house. This appeared to be a cast iron pipe with a 90 degree angle piece attached to it, which also points straight up (to the sky so to speak). So I did a little more digging.... After digging about two feet horizontally from the location of this angled piece I stopped. I wondered how long this pipe really was and if I was wasting my time removing it so I got out the equipment and started another sweep. It took a little while but guess what I found?...... This pipe goes from the location of where this "stone" or "concrete" structure is all the way INTO the pond itself.
I am tempted to make a video of doing a sweep of this area with the audio of the equipment patched into it for presentation purposes. But I guess you will just have to take my word for it at the moment that what I traced is in fact a pipe going into the pond. Anyway, at this point I am concluding that this structure really did have something to do with water and that the pipe which was found had something to do with a water pump much like you would find on some wells. It would also be easier to bury a pipe a foot or two underground and draw water from a pond rather than try to dig an actual well. Otherwise, why would anyone invest the money and the time to bury a fairly long and very heavy pipe and drop it into a pond?.... Especially if this pipe is really as old as it appears to be. It is simply back-breaking work and they would need a very good reason to go through all of that trouble.
But again, this is very odd to be next to the cemetery. The only thing I can think of at this point is that the stories of the cemetery, with the people using it like a park, and the fact that there were two homes a very short distance west of the cemetery... that in all likelihood this was a location that was used to store water for people much like you would store water for a horse. I'm not saying that it is for horses but what I am suggesting is that it may very well have been used as a drinking area or possibly used as an area where a particular family washed their clothes if they enjoyed doing such a thing while visiting their loved ones. Another point to make, and is about why this structure appeared to be used for water, is that if you study the structure it has an area that goes "up" and is very crude in nature. It looks like a crude "stepping stool" for people too short to reach the water. Put in place for children to use perhaps? Of course this is just a theory but it would fit with other structures created a long time ago for the purpose of water.
I will eventually try to pass this information to someone that knew people from a long time ago that would use the area but I'm not sure I will get any answers as to if this was a well pump that was abandoned before they arrived. Maybe I can get an answer as far as "Yes, I remember there being a pump out there but it never worked" or "Yes, there used to be an old pump but the parts were laying everywhere."
So we have a metal plate that had something to do with water, a metal pipe going into a pond and an area that resembles a structure used to store water... A lot of this is food for thought and I figured it was time to share some of my findings. The concerns that this may have been a burial site should probably be put to rest. Of course there is always a chance that the County didn't get the cemetery boundaries correct but this particular area is probably no longer a concern. If anyone has anything to add please feel free to share!
Pete