For Shenango, if you go to the dam, they give tours, or at least use to, they have maps for free(?), that are on paper. It gives you all the info, plus where they put cribs, and possibly xmas trees too. Have had one for years, that a neighbor laminated for me, so of course, it isn't current with newer ones. But is still a valuable tool.
Npt sure, but the tours might be only on weekends.