Garreg Ddu Dam.

Garreg Ddu Dam also known as the submerged dam is the second of the Elan Valley Dams. The completely submerged dam which plays a vital role in maintaining a constant supply of water to Birmingham. Garreg Ddu holds water back on the upstream side so that water can always be extracted at the Foel Tower.

Height of weir - 82 ft above river bed
Total capacity - 4,585 million gallons

Height - 123 ft above river bed
Length - 417 ft 6 in.
Total capacity - 1,320,000,000 gallons



Garreg Ddu during the summer of 2018



Garreg Ddu during 1936, photo courtesy to Ann Lloyd, Rhayader


Garreg Ddu during the drought of 1975, photo courtesy to Rob Davies, Rhayader


Garreg Ddu before the dams were built, photo courtesy to Mrs Pauline Walton, Rhayader


Garreg Ddu before the dams were built, photo courtesy to Mrs Syd Meredith, Newbridge-On-Wye


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