The reservoir itself is unremarkable from the surface, a piece of functional infrastructure that has quietly flooded over the dead. That is precisely what makes it worth knowing about.

When the reservoir was dug around 1910, the excavation work turned up two distinct types of burial evidence. According to the archaeologist Seán P. Ó Ríordáin, writing in 1942, the dig produced both extended burials and urns. Extended burials are those where the body was laid out flat, a practice associated with various periods of Irish prehistory and early Christianity alike. The urns, by contrast, point toward Bronze Age cremation traditions, in which the ashes of the dead were placed in ceramic vessels and interred in the earth. The presence of both types together suggests that the site may have been used across more than one period, or that it served a community whose funerary customs were not uniform. Ó Ríordáin's note is brief, recorded at a remove of several decades from the original disturbance, and no detailed excavation report appears to have followed the discovery. What exactly was recovered, and where those objects ended up, is not recorded in the available sources.

The site sits within Coshma barony, a territorial division in the southern part of County Limerick. Because the burials were encountered during construction work rather than systematic excavation, the findspot is defined today primarily by the footprint of the reservoir rather than any visible monument. There is nothing to see at ground level, and the archaeological material was almost certainly removed or destroyed during the digging. A visitor with an interest in the landscape would do better to read the area as a reminder of how much was lost during the infrastructure works of the late nineteenth and early twentieth centuries, when drainage schemes, road improvements, and water supply projects routinely cut through sites that had never been surveyed. The Raheen reservoir is one small example of a very widespread pattern.