Mertoun Bridge has no piers built into the bedrock and it takes road B6404 over the River Tweed near St Boswells.
The Mertoun Bridge is a bridge across the River Tweed in the Scottish Borders. The piers built between 1 and 3 feet (0.30 and 0.91 m) into the bedrock, which was achieved by using cofferdams, and the depth of the bottom of the piers is between 6 feet 3 inches (1.91 m) and 11 feet 7 inches (3.53 m) below the summer level of the river. 
