These lake dwellings were used in Ireland from the Bronze Age well into the early medieval period, sometimes beyond, and their inaccessibility was precisely the point. A small stretch of open water made for a defensible home, and many crannogs remained in use, or were reused, across remarkably long spans of time.

Bun Alltaí is a small townland in Mayo, a county with no shortage of lake-studded landscape, and crannogs here are not unusual in themselves. What makes any individual example quietly compelling is the layered ordinariness of the thing: generations of people choosing a patch of water, driving in stakes, piling up material, and living there. Excavated crannogs elsewhere in Ireland have yielded fine metalwork, wooden vessels, animal bones, and the accumulated debris of daily life, all preserved by waterlogged conditions that would destroy the same objects on dry land. Whether the Bun Alltaí example has ever been formally investigated is not currently known from available sources.