The causeway linking Canon Island with the smaller Inishloe Island is not a ruin in the conventional sense; it is a deliberate, engineered path laid into an estuary, and its curved alignment suggests it was planned with some care rather than simply thrown together from available stone.

The structure appears on Henry Pelham's 1787 map of County Clare, which places it firmly in the historical record well before the nineteenth century and hints that it was already a recognised feature of the landscape by the time cartographers were paying serious attention to the region. It was constructed from medium-sized boulders, a practical choice for tidal conditions where smaller material would shift and larger stone would be difficult to lay in a curved formation across soft estuary ground. Canon Island itself is known for its Augustinian abbey, founded in the medieval period, and a causeway connecting it to a neighbouring island would have had obvious practical value for those moving between land and water at the edge of the Shannon system.