By 1903, the same map series recorded it as already in ruins. Today, it is gone entirely, claimed by the sea.

The watch house was part of the 18th-century apparatus attached to Rosslare fort, positioned so that Revenue officers and pilots could sight incoming vessels at the greatest possible distance before they reached the harbour. That practical purpose tells you something about the pressures of the period: smuggling was a serious concern along the Wexford coast, and the pilots who guided ships through local waters needed advance notice of approaching traffic. A modest elevated structure at the fort's angle would have served both groups, giving them a meaningful advantage of time. By the mid-nineteenth century it was standing but deteriorating; by the early twentieth, it was a ruin; and at some point after that, coastal erosion finished what neglect had started. No trace remains above ground or at the waterline.