The well at Crowscastle sits beside a small stream that marks the townland boundary between Crowscastle and Barrysparks, in north County Dublin, and it was once attributed with the power to cure sore eyes. Holy wells, natural springs that acquired devotional significance over centuries of popular religious practice, were once common features of the Irish countryside, each typically carrying a patron saint's name and an associated healing tradition. This one belongs to St Werburgh, a name more readily associated with Chester and Bristol than with the north Dublin hinterland.

By the time the folklorist Caoimhín Ó Danachair recorded it in 1958, the well was no longer being venerated. Children at Swords National School had noted it in an earlier folklore survey, describing it as lying about three miles from Swords near Feltrim and claiming it could cure people with pains, a slightly different tradition from the sore-eyes cure recorded locally. When Henry A. Wheeler visited the site on 8 October 1975 and logged it in the Sites and Monuments Record, he found a small concrete enclosure, dry and filled with brambles, its foundations partly undercut by the adjacent stream. Photographs taken by Ó Danachair, now held in the National Folklore Collection at UCD, document the well during its period of neglect. In March 2011, work was carried out to clear and reconstruct the site; the well was redug in a different position, plastic piping was inserted, and stone was removed in the process.

The well is now signposted and accessible, though those expecting an undisturbed historic feature should be aware that the 2011 reconstruction significantly altered its physical character and original location. The stream alongside it remains, and the townland boundary it marks gives the site a quiet geographical logic even if the devotional atmosphere has long since dissolved. The Dúchas Schools' Collection entries relating to the well can be read online through the duchas.ie archive, and Ó Danachair's photographs are accessible there too, offering a useful counterpoint to what visitors will find on the ground today.