Looking carefully at the picture, I think I can spot the older cabin at the far end of the structure - the part with the stone foundation. I understand it is listed on the National Register of historic Places; it would be close to 100 years old now

The concrete dam was there in 1957; one of our chores that year was to muck it out to improve capacity. I imagine they have abandoned the phone line which we kept in repair back then; our radio system was not to be relied upon entirely.