The dam

Lots of folks in Black Mountain believe in living in a more "natural way" than they used to, back in the cities, or whenever they visit the structures which show great engineering feats.

Here's a slightly more natural kind of dam...earthen that is, rather than concrete.  It does have engineering proclaimed through a sluice gear which can be opened whenever there's flooding upstream in the mountains.  It allows the lake to be drained quite a bit if needed.

There's the control valve.