Pont Dysynni (partly in Bryn Crug community)

Pont Dysynni is a bridge constructed from local stone rubble. It features four semi-circular arches, each with a span of 6.3 meters, made of squared voussoirs that are set back under a square profile regulating course. The arches rise 1.8 meters above the water. The bridge has flush spandrels and a parapet, which is capped with stone flags. The water piers are built on starlings, with a cutwater of approximately 120 degrees on each side. From these, pilaster buttresses rise to the coping, with one offset. The roadway measures 3.75 meters in width between the 0.43-meter-high parapets and is humped over the river spans, giving the bridge a slight 'S'-curve in plan. An iron plate by Isaac of Portmadoc is reset in the eastern parapet, prohibiting locomotives from crossing due to the bridge's insufficient strength.