The causeway's visible section on Wheeldale Moor shows the remains of a continuous surface metalled with closely fitted slabs of sandstone with flat upper surfaces. The average size of a slab is square, but some examples are in breadth. The purpose of a central ridge along one section of the causeway, described in two independent excavations, is unknown. The stone flags are seated on a cambered base of mixed gravel, clay and either rubble, peat or soil, that forms a raised embankment. The embankment is from wide at its raised surface. Its width in some sections is increased by of ditch to either side, which may or may not be associated with its original construction, making an approximately uniform total width of . Its height above surrounding soil level is approximately .