Today the site is a housing estate on low-lying, flood-prone ground, marked only by a roadside plaque. What had once been described, in the early thirteenth century, as lying in the suburbs of the metropolis of Tuam was by the twentieth century buried under tarmac and foundations.

The Abbey of the Holy Trinity was probably founded around 1203 to 1204 by William de Burgo, one of the Anglo-Norman lords who reshaped Connacht in that period. It belonged to the Premonstratensian Canons, a religious order founded in northern France in 1120 whose members, sometimes called White Canons for their habit, followed a rule of communal life and contemplation. This was a daughter house of that order, planted on the western fringe of a town that was then an ecclesiastical centre of some significance. James Morris's 1720 map of Tuam shows the abbey as an H-shaped structure aligned roughly north to south, suggesting it still had legible form at that date. By 1791, however, that form was being actively erased: a record preserved in the Ordnance Survey Letters notes that a considerable part of the abbey remained until that year, when Archdeacon Burton carried off the stones to build a house. The 1932 edition of the six-inch Ordnance Survey map still recorded an oblong earthen mound, measuring roughly 45 metres west-northwest to east-southeast and 25 metres across, but that mound did not survive the development decades that followed.

The commemorative plaque on the roadside is easy to miss, and there is little else to orient a visitor to what once stood here. About 100 metres to the north-northeast, however, a holy well survives, a small reminder that this stretch of ground was once considered to carry some devotional weight.