• Cymraeg
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    NPRN267141
    Map ReferenceSO23SW
    Grid ReferenceSO2347030631
    Unitary (Local) AuthorityPowys
    Old CountyBrecknockshire
    CommunityThe Vale of Grwyney
    Type Of SiteCULVERT
    PeriodModern
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    Description
    The Cwm Grigws Isaf stream is carried underground for approximately 26m northeast-southwest to join the Grwyne Fawr through a concrete shuttered tunnel under the modern road. J.J.Hall, Trysor, 27 September 2007