Longbridge

The appearance of the name Longbridge at Plympton appears to date from an early seventeenth century bill that was passed for the "inning of Plympton Marsh". The result of this bill was that in 1618-19 the width of the Laira was reduced and a causeway was driven across the Marsh Mills mud flats.

This Causeway was the Long Bridge, a bridge in the sense that it was a "structure affording passage between two points at a height above the ground". Beginning at the "bridge over stream that flows by the side of Marsh House", Long Bridge did not extend over the Plym itself.

The crossing there was, until 1753, by means of a ford. That mid-eighteenth century bridge was, sixty years later, superseded by the structure that still stands there today and which was called when built - New Bridge.