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    Carreg Ddu viaduct and Foel Valve Tower, looking north-east. Photographed as part of Archaeological Desk Based Assessment of Afon Claerwen, Elan Valley, Rhayader, Powys. Assessment conducted by Archaeology Wales in 2018. Report no. 1681. Project no. 2573.Opsiynau lawrlwytho a prynu
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    NPRNTeitlMath O SafleArchifauDelweddauNPRN752TeitlGarreg-Ddu Dam, Elan Valley Water Scheme;Carreg Ddu Viaduct and Submerged DamMath O SafleARGAEArchifau55Delweddau37NPRN32527TeitlElan Aqueduct: Foel Valve Tower; Garreg-Ddu Reservoir Tower, Foel TunnelMath O SafleTŴR Y FALFIAUArchifau19Delweddau14