From the picture it appears that the below grade structure is a grain dump pit. Here are some links to what a modern one looks like. https://connect2local.com/l/232768/c/5015530/what-is-a-grain-elevator-pit
https://innovativeagproducts.com/speedy-pit
https://www.youtube.com/watch?v=0cwsa6vDqZQ
That may be why the crater seems larger than what would be caused by an S-300.