Drybridge Lodge, Mostyn, built in 1849 by Ambrose Poynter, is one of a fine series of 19th century lodges and gates forming the architectural setting of Mostyn Park. It is a castellated lodge of 2 storeys superimposed on a bridge above a road, with an integral tunnel. Built of ashlar and with a hipped slate roof and diagonal shafted chimneys, the lodge has an embattled parapet on a cornice with an arcaded frieze. A symmetrical 3-bay front faces to the drive. The central bay has a wide and high 4-centred arch with hood mould and double cast iron gates, which have spear finials and quatrefoils to the base and lock rails. The mullioned windows are Tudor-headed with hood moulds and incorporate small-pane glazing with Gothic glazing bars. The tunnel has a horseshoe arch to ashlar portals. In each arch is a keystone with a grotesque head in relief.