Look at it from the right angle and the join is there, a seam in the masonry where an earlier structure ends and a later addition begins.

The original bridge has five semi-circular arches whose spans increase gradually towards the centre, a classic proportioning technique that distributes load and gives the structure a subtle visual rhythm. The voussoirs, the wedge-shaped stones that lock an arch together, are rough-hewn on the original section, suggesting construction well before finish work became a standard expectation on rural crossings. At some point in the late eighteenth or early nineteenth century, the bridge was widened by approximately three metres on its upstream, western side. The widened section follows the same semi-circular arch form but the arches are fractionally smaller, and the voussoirs here are cut stone rather than rough, reflecting either improved craft or a different contractor. The widened portion also gains pointed breakwaters, the projecting angular piers that split the current and reduce pressure on the arch foundations, which the original section notably lacks. The same approach was taken at Conna Bridge nearby, suggesting this kind of incremental widening was a recognised regional response to increasing road traffic during the period, when bridge decks that had served a quieter era suddenly needed to accommodate carts and coaches in greater numbers. The total width across the deck today is 4.2 metres, modest by modern standards but the product of two distinct building campaigns separated by perhaps a generation or more.