The towers of the West Port are said to have been modelled after those of Netherbow Port in Edinburgh (which, in turn, was based on the Porte Saint-Honore in Paris). The gateway consists of a decorated central arch with the addition of side arches added during the 1843 rebuilding work.
The gate was not intended for defence but as an impressive entrance into the city; a mark of civic pride, meant to impress visitors.
Unlike many historic monuments we know exactly who built the Westport Gate; it was the work of Thomas Robertson, who incorporated parts of an earlier gateway on the same site. Robertson created a central, rounded arch flanked by semi-octagonal towers. Between the towers ruins a corbelled parapet sporting a series of waterspouts in the style of cannons.
The gateway was allowed to fall into decay and was comprehensively restored in 1843 by John Grant, who removed a large buttress and substituted several small ones. He also added a plaque with the city coat of arms, two side arches flanking the central arch, and a panel depicting David I on horseback.
West Port is in the care of Historic Scotland, and only the exterior of the gate can be viewed.