Crossmod
Full Member
I think its an old septic system. Someone had to dig down to find the lid and then it took a few days to go back and fill it in and household members threw junk in the hole.
No septic systems in our area. I checked historical data as soon as I dug the concrete slab , assuming it was a let or walkway to an old barn. Checked aerial photos from as far back as 1920. Nothing behind my home except farmland.