Ruined windmills are uncommon enough in Ireland to warrant attention whenever one surfaces; the country never developed the dense milling culture of the Netherlands or East Anglia, and those towers that were built tended to fall out of use early, stripped of their sails and machinery once steam or water power became more practical. What remains at Tawnagh is, by the fact of its survival in any form, a remnant of an industry that left few traces in the west of Ireland.

Irish windmills were typically tower mills, round or slightly tapered stone structures designed to hold a rotating cap and four sails that could be turned to face the prevailing wind. They required an elevated or exposed position to catch enough airflow, and Connacht, with its Atlantic winds, was not an unreasonable place to build one. Milling by wind was never as reliable in Ireland as in flatter, more consistently breezy regions, which partly explains why so many examples were abandoned or converted to other uses within a generation or two of construction. The Tawnagh mill fits into that broader pattern of optimism and retreat that characterises much of Irish rural industrial history.