Ffynnon Llugwy

Ffynnon Llugwy is a lake in the Carneddau range of mountains in Snowdonia, North Wales.

Ffynnon Llugwy
looking south
Ffynnon Llugwy
Location	Snowdonia, North Wales
Coordinates	53°8′45″N 3°57′23″W
Type	natural, reservoir
Primary outflows	Afon Llugwy
Basin countries	United Kingdom
Surface area	40 acres (16.19 ha)

It lies at a height of about 1,786 feet (544 m) and covers an area of some 40 acres (16.19 ha). It has a maximum depth of 146 ft (45 m).^[1]

Since the early twentieth century water has been taken from its outflow, the River Llugwy to feed Llyn Cowlyd via a series of leats.

Since the mid-1970s the lake has additionally acted as a reservoir for Bangor and eastern Anglesey, which necessitated the laying of an 11-mile pipeline to the water treatment works at Mynydd Llandygai.^[2]

It is the source of the River Llugwy which flows via Capel Curig and Betws-y-Coed before becoming a tributary of the River Conwy.