There was one at the base hanging across, but really never saw anything else. There is a parking area at the base of the glen that is clearly used by visitors. So i sensed, and from the other comments from this site, that the owner does not object to visitors but for legal purposes they need to protect themselves. Really pretty glen walk!
Someone here mentioned another 30 footer just above the large falls. I scrambled up 100 feet in the rain and there was no way i was going across the 8 inch ledge which was loose shale at the top of the falls, with a 100 foot vertical by 15 foot horizontal sheer drop as my "plan B."