A small castle work on the banks above the River Olchon on a spur of foothills of the Black Mountains. A river naturally protects the entrenchment on the NE. It consists of a mound 33ft surrounded by a moat with a court protected by a hillside scarped on the NE and guarded by a rampart on the other sides.

The motte is almost circular, 51yards diameter at base and rising 30-40ft above a dry ditch.

There is one irregular crescent shaped bailey protected by a scarp only, except for at junctions with the motte ditch where there are two lengths of rampart, 11ft above the bottom of the ditch.

This is thought to be the site of an earlier castle than that at nearby Longtown, perhaps even the ‘Castelli de Ewias’ mentioned in the Pipe Rolls of 1187.