NPRN267141
Map ReferenceSO23SW
Grid ReferenceSO2347030631
Unitary (Local) AuthorityPowys
Old CountyBrecknockshire
CommunityThe Vale of Grwyney
Type Of SiteCULVERT
PeriodModern
DescriptionThe 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
