The dam of this Carneddau reservoir failed in 1925, sending a flood down to Dolgarrog that killed sixteen people.
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Llyn Eigiau is a llyn in Conwy. It sits inside Eryri National Park. The nearest railway station is Dolgarrog, 2.8 km to the east. Nearby lakes & lochs include Llyn Crafnant and Llyn Geirionydd.