That mound sits enclosed by a stone wall on level ground just south of a minor road, with open views northward toward Killala Bay. What makes the site quietly odd is the gap it represents: a two-storey square watchtower, built around 1804 to 1806, already gone by the time the third edition Ordnance Survey map was produced around 1910, and visible on the first edition map of circa 1836 only as a small marked footprint. It disappeared from the landscape before photography could catch it, and now the most concrete evidence of its existence is a slight rise in a field.

The tower at Creevagh was one of more than eighty signal stations constructed by the British Board of Ordnance along the Irish coastline during the first decade of the nineteenth century, when the threat of a French invasion fleet was taken seriously enough to justify a continuous chain of watchtowers running clockwise from Dublin Bay all the way around the coast to Malin Head in County Donegal. Communication between stations was carried out using a naval signal post, a system of flags and markers that could relay warnings along the chain with reasonable speed. The towers were typically built in roughly coursed rubble stone masonry, square in plan and two storeys high. Creevagh's example would have been positioned to communicate with neighbouring stations: Glensky Head to the west and towers near Lenadoon Point and Rathlee to the east and south-east, though modern buildings now obstruct some of those sightlines. The whole network was abandoned by the mid-1810s once the Napoleonic threat receded, which left dozens of small stone towers scattered around the Irish coast, some surviving better than others. Creevagh's did not survive well at all. The site also sits within a notably layered landscape; a megalithic structure lies about 200 metres to the south-south-west, and a court tomb, a Neolithic monument typically consisting of a roofless stone-walled forecourt leading to a burial chamber, lies around 850 metres to the south-east, both within the same townland boundaries.