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.