Though no visible traces remain today, historical illustrations from the 18th and 19th centuries provide valuable insights into its appearance. The castle was documented by Wright in 1758, Grose, and Petrie, with the latter’s drawing showing its position west of Termonfeckin bridge. These historical records reveal a fortified structure with two angle towers and a lower building extending from the opposite side.

The castle’s defensive bawn featured what appears to have been a round tower, likely positioned at one of its corners. This architectural detail, captured in both Grose’s and Petrie’s illustrations, suggests the site combined both ecclesiastical and defensive elements typical of important religious residences in medieval Ireland. The presence of angle towers and the strategic riverside location would have provided both symbolic authority and practical security for the archbishop’s household.

While the physical structure has completely vanished from the landscape, the detailed drawings that survive offer a window into Termonfeckin’s medieval past. The castle’s disappearance reminds us how many of Ireland’s historic buildings have been lost to time, making these early artistic records invaluable for understanding the country’s architectural heritage. The site now exists only through these careful documentations, preserved in various historical surveys and archaeological inventories of County Louth.