What survives is modest but coherent: a roughly double-banked enclosure measuring about 39.5 metres east to west and 32 metres north to south, with a fosse, or ditch, running between its two banks. This double-bank-and-fosse arrangement is a design associated with enclosures intended to define and defend a space, whether for settlement, livestock, or ritual use, though at Lecarrow no associated finds or structures have been documented to settle the question.

The earthwork is poorly preserved, and different parts of it have survived in different ways. The inner bank is clearest along the north side and from the south around to the west; elsewhere the ground simply drops away in a scarp, the remnant of what was once a more substantial feature. Traces of the outer bank remain visible on the western side. A gap roughly 4.5 metres wide at the south-west corner may represent an original entrance, which would offer some clue that this was a functioning enclosure rather than simply a field boundary, though the evidence is inconclusive. The Galway Archaeological Survey, which compiled the record, noted the site without assigning it a firm date or function, which is itself a kind of honesty: many such earthworks in the Irish midlands and west resist easy classification.