Crugian Bach Enclosure comprises a small sub-oval enclosure, probably dating to the Bronze Age. It is defined by spread stony banks which only rise to a maximum of 0.3 meters above the peaty exterior. The enclosure measures approximately 13 meters north-south by 11 meters east-west. The only visible internal feature is a faint in-turn of the bank which may represent an entrance or possibly the remains of an internal structure.

The enclosure is located close to scheduled cairns (BR375) and a stone circle (BR274).
Source: Cadw scheduling description of March 2011