Llyn Aled Isaf

Rhyd y Bedd concrete dam, surmounted by a road deck

Date	28 July 2012
Location	Mynydd Hiraethog (Denbigh Moors)	SH 91510 59874; 53.12495°N, 3.62274°W
Information	The Afon Aled, a tributary of the Afon Elwy, was dammed at Rhyd y Bedd in 1938, creating the Llyn Aled Isaf reservoir. The latter is linked to Llyn Aled further upstream, and both were originally intended to supply water to Rhyl and Prestatyn. The necessary aqueduct was, however, never built and the reservoir now serves to regulate the flow of the Afon Aled. When the level of the reservoir fell during a drought in 1974, evidence was discovered of Early to Late Mesolithic settlement, including flints, hearths and stake holes of possible campsites. Mynydd Hiraethog (Clwyd-Powys Archaeological Trust); Llyn Aled Isaf, Mesolithic Occupation Site (Royal Commission on the Ancient and Historical Monuments of Wales)

Chevron

Radii

Arrowhead

Looking towards the Afon Aled ravine from the top of the dam. The Rhaeadr y Bedd waterfalls are out of sight over the edge. On the left are falls created from the reservoir outflow and when the reservoir’s level is high, water spills over the top of the dam emptying into the channel seen here and creating a second waterfall.

Looking down the dam to the concrete valve house

Big pipe

Big pipe

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