High above Bryn Eglwys Slate Quarry is a solid piece of engineering - The Llaeron Dam. Built in the mid 1860s it held back the large Llaeron Reservoir as a water supply for the quarry. Made of earth faced with stone and capped with a slab wall it remained intact until breached for safety reasons following the closure of the quarry. The circular structure was the control tower, accessed by a walkway from the dam.
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