The monument includes a packhorse bridge known as `Gallox Bridge' which spans the River Avill on the southern outskirts of Dunster. The bridge has a roadway width of 1.2m, a total width of 1.9m and is 13.5m long. It has two arches which are slightly pointed and have double arch rings. Each side has four narrow chamfered ribs. There is a cut-water on the upstream side which is 0.5m long. The bridge leads to a causeway skirting a ford on the north side. It is still used as a public footbridge, and is a survivor of the simple type of stone bridge to be found in the West Country and elsewhere. It is reputed to be of 15th century date. The bridge is Listed Grade I and is in the care of the Secretary of State.