I was there as a kid.Is there a lake on top,where they cut off the peak where folks boat & fish,evacuate around 5pm so they can flush it to run the turbines that generate electricity,then slowly pump it back up for the next day?Or was I misled?

The pumped-storage hydroelectric plant was built to help meet peak power demands during the day. Electrical generators are turned by water flowing from a reservoir on top of Proffit Mountain into a lower reservoir on the East Fork of the Black River. At night, excess electricity on the power grid is used to pump water back to the mountaintop

As others have said, it's at Johnson Shut in State Park feeding the river there. I'm uncertain if you can boat on it, but check out the info on that park.

It's a resivor for the hydro plant that was rebuilt around 2005.

That is at Johnson shut inn

Never heard anything of that before. I have camped up there never seen what you are talking about, sorry.