Ffynnon Gadfarch is one of those saints wells that has slipped away virtually unnoticed, the maps however still retain a faint trace in the name of the bridge that crosses the fast flowing River Erch just to the north, actually called Pont Fynnon-Gadfa ( I think we just have to assume the rest, but maybe even this shows the degree to which the well has been lost) a grade 2 listed causeway from the early 19th century. It lies a little to the north of the village of Y Ffôr off the Caernarfon to Pwllheli road.
(Then again maybe that always was the name and other people have jumped to conclusions)
Turning to the Lives of the British Saints, it is reported that Cadfarch was a monk at Bangor Dunawd, and a brother to saints Cawrdaf, Tangwn and Maethlu. He was formerly the patron of the church of Aberech, although this honour has now passed on to his brother Cawrdaf, whose own well, to be fair, has survived only slightly better. Cadfarch remains the patron of Penegoes church in Powys, where another well dedicated to the saint has survived a little better.
Lives of the British Saints notes that the Abererch Ffynnon Gadfarch is near the site of an extinct chapel called Llangedwydd, although the 1964 Report of the Royal Commission casts doubt on this, suggesting that the supposition of the existence of a chapel is based purely on the Llan- element of the surviving name Llangedwydd, which is more likely a corruption of an earlier name starting Llyn- or Llen-. Although Francis Jones notes that water from this well was once carried to the parish church for use in baptism, this is in fact an incorrect attribution and should refer instead to Cawrdaf’s well which is much closer to the church.
The Commission visited the well and noted that it had been modernised and indeed it ha. Basically what we see today is nothing but a large grey concrete structure in the field beside the river. These days the water is piped away, presumably to serve the local community.
Royal Commission on Ancient and Historical Monuments in Wales (1964) Caernarfonshire West
Baring Gould S and John Fisher (1908) Lives of the British Saints
Jones, Francis (1954) Holy Wells of Wales
Ffynnon Gadfarch SH39974021