Found right next to the Field House at Spruce Run reservoir in Clinton, NJ
I immediately want to get up to the top to use it as a photography point. But I didn’t see any way to get up there from the two rooms below (which are rest rooms). So I left baffled. Then I read a post on a nearby display area that showed an old drawing. On the drawing was a staircase on the outside on the wall showing in this picture. I guess it either became unsafe from a structure point of view or just plain safety as I’m sure kids would try and hang out up there.