During May 1846, groundwork for the bridge commenced. The architect Francis Thompson (architect) dressed the pylons at either end as barbicans, with crenellated turrets, arrow slits and bartizans to complement the adjacent Conwy Castle. Unusually, the tubes were completed onshore before being attached to pontoons, floated along the river and jacked into position between the abutments. The bridge was officially opened in 1849. The bridge endorsed the construction of the larger Britannia Bridge. During 1899, the tubular sections were reinforced with cast iron columns to reduce the load on the span across the river. In September 1950, Conwy Tubular Bridge was recognised as being a Grade I listed building; it is also a scheduled monument (CN167).