Lillian and I hiked to Switzers Camp on Tuesday and saw this sign at the beginning of the hike. We discussed the entomology of snag for much of the hike. I maintained that a snag (noun) referred to an obstruction in a river. It ended up being the first of many definitions in the iPhone dictionary.
btw The Switzer Falls were great. Beautiful hike five miles round trip. Mostly along a stream. Watch out for the “snags” (dead trees) Really the bigger problem is the poison oak.