A simple form of bridge design features a series of stone slabs set atop rock pilings. It’s perhaps one rung up from stepping stones placed in the water or logs laid from bank-to-bank on the evolutionary scale of bridge design. It certainly falls within the more primitive bridge construction types imaginable. In England, particularly the County of Devon, it’s a form known as a clapper bridge...The Text above is from Twelve Mile Circle.
Gravity alone holds everything in place without the benefit of mortar. Most of this construction took place from the middle ages through the early Nineteenth Century. They are quite common in Dartmoor and one gentleman has cataloged and visited more than 200 of them...
At the Widecombe-in-the-Moor website it was noted that -
The definition of a clapper bridge is flat stones held in place only by their own weight. Some of them have only one slab but they can consist of up to nine [note this one]. Some have pillars, some are laid directly onto the banks (cart clappers).
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