Look along its length and the difference becomes legible: at the north-eastern end, three semicircular stone arches survive from the original construction, their voussoirs, the wedge-shaped stones cut to form the curve of an arch, still dressed and fitted with care. Low pointed breakwaters project upstream to deflect the river's force away from the piers. At the south-western end, those older arches give way to two much wider elliptical spans in concrete, a later intervention that also widened the carriageway beyond its original 4.25 metres. The result is a structure that is visibly mismatched, narrower and older on one side, broader and more utilitarian on the other.

The original bridge carried a road across the Sullane on a north-east to south-west axis, and the surviving stonework suggests a level of craftsmanship consistent with formal bridge-building traditions rather than rough field construction. The concrete replacement at the south-western end took over from what had been three or four original arches, suggesting that section either deteriorated beyond repair or was deliberately widened to accommodate heavier traffic loads as road use intensified. Seven arched overflow channels, three to the south-west and four to the north-east, are distributed along the structure, allowing floodwater to pass through rather than build pressure against the bridge itself, a practical detail that reflects how seriously the Sullane's tendency to rise was taken by whoever designed or later modified the crossing.