"Baile an Ghaibhnig or Smithstown castle [is] a square
tower with the eastern side fallen out and gutted. It lies south west
from Six Mile Bridge on the Limerick and Ennis road."
From 
Letters
on the Antiquities of County Clare, 1835 by Eugene O’Curry
Description in
Ordnance Survey Letters
by J. O’Donovan and E. Curry, 1839
Description,
drawings and photographs in A
Survey of Monuments of Archaeological and Historical Interest in the
Barony of Bunratty Lower, Co. Clare by W.G. Ryan
Search the online photographic collection for images of Smithstown/Ballynagowan Castle
On 1842 Ordnance Survey Map (using GenMaps)
On Bing maps satellite view (using GenMaps)
On Bing maps satellite view with OS Map overlay showing all monuments and enclosures (using GenMaps)
On 1842 Ordnance Survey Map (via MapBrowser)
