The townland of Tristaun, in County Galway, is home to one such structure, recorded as a monument but sitting at the quieter edges of what is formally documented.

Mills of this kind typically ground cereal crops, oats and barley especially, using the energy of a diverted watercourse to turn a millstone. They were central to the rural economy from at least the medieval period through to the nineteenth century, when industrialisation and consolidation gradually made small local mills unviable. Many were built and rebuilt over generations, leaving behind masonry that can be difficult to date precisely without closer inspection. The Tristaun mill fits into this wider pattern of vernacular industrial heritage that remains underexamined across Connacht.