Claim: Mertoun Bridge that carries B6404 over the River Tweed was designed by James Slight and constructed by William Slight, finished in 1841 and used ashlar for the masonry.
Evidence: The bridge carries the B6404 public road across the River Tweed near St Boswells. James Slight William Slight 1841 The masonry used is ashlar, and the stone is a reddish sandstone quarried nearby.