The well was blocked up and the area backfilled within recent memory, leaving only a slight depression in the ground as evidence of what was once a working water source. It is the kind of absence that is easy to walk past without registering, yet the Ordnance Survey recorded the spot clearly on both its 1840 and 1921 six-inch maps, naming it simply Castle Well.

The well was fed by a spring rising through a naturally formed fissure in the limestone bedrock beneath, the kind of karst geology that underlies much of County Clare and makes groundwater behave in unpredictable and sometimes vanishing ways. Its position, roughly 35 metres to the south-east of the remains of Lissofin Castle, was no accident. Local information suggests it functioned as a draw-well, meaning water was raised by rope and bucket rather than flowing freely to the surface, serving first the castle's inhabitants and later the McNamara farm that sits adjacent to the south-west. Ua Cróinín and Breen, writing in 1997, noted that a small circular well could still be seen at that time, placing it in relation to the castle that had relied on it. The bawn, a defensive walled enclosure of the type typically built to protect livestock and people around an Irish tower house, stands about 20 metres to the west-north-west, and the castle ruins a little further beyond.

Anyone walking this ground today will find the site is legible mostly through its surroundings rather than any surviving structure. The thicket of thorn trees that encircles the depression has the look of something long-established, the kind of scrubby growth that tends to colonise disturbed or marginal ground and then simply persist. The pasture around it is gently undulating, with open views in most directions, and the relationship between the well site, the bawn, and the castle ruins can be read across a relatively small stretch of field.