The bridge is 105ft long and consists of five spans, symmetrically arranged, the centre span measuring 15ft. The arches are segmental and spring just above water level from low, pointed piers. Solid masonry parapets run parallel across the water, inclining downwards only over the bankside arches. The roadway is 18ft wide and was originally the main London to Devon carriageway. It is now the A303 and bears only local traffic.

Another Smeaton bridge, the Ornamental Bridge of 1777, can also be found in Amesbury.