At Postbridge the river is spanned by an early medieval clapper bridge (possibly the twelfth century) it is an early form of beam bridge. The first documentary reference to the bridge, however, dates from 1655.
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The bridge is constructed of long thin slabs of stone which form the deck or beam of the bridge laid over stone piers.
The bridge was originally built to allow packhorses which were carrying tin to the stannary town of Tavistock to cross the East Dart River at this point.