So the removed set of photos included the diver, replacing a valve.
The New York DEC told me today that WT owns the dam, and is responsible for lowering the level of the lake using a spillway in the event of high rainfall, etc.
The larger valve was required to comply with an upgraded standard for Class C dams.
Apparently it is not uncommon for private corporations or private owners to own (and have to provide maintenance for) dams on lakes in NY state.
No scandal here.