The purpose of the path

Capture

I was fascinated, as I always am, by the rock stairs built on the trails.  In looking at this photo I am curious as to the purpose.  If this is meant to be a spot for safe crossing of the water it is contradicted by the fact that just on the other side of the carriage road bridge you see a small wooden bridge crossing the water, so why would I make a water crossing when I need only travel a 100 feet farther to cross by bridge.

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Perhaps there is a more mystical reason for this path; is it the spot where the water sprites emerge and walk the path to the human world?