Sunken enclosure, 2ft deep, rough slated masonry 6ft by 2 1/2ft. Now dry.
RCAHMW 2nd July 2012

'Remains of an old well, set into steeply sloping ground on the south western flank of Mynydd Tyn-y-fach. At the time of inspection, the water was still flowing but it seems that a modern cutting a few metres north (and marked on OS maps), has diverted the main flow. It consists of a rectangular trench or chamber 2m long by 0.9m wide, enclosed on three sides by drystone walling up to 0.7m thick and composed of large boulders. A number of flat slabs scattered about might have once served to roof the chamber.'
Field notes written by Paul Davis concerning site visit conducted on 28th March 2019
RCAHMW, 3rd May 2019