Latitude: 51.7924 / 51°47'32"N
Longitude: -3.4349 / 3°26'5"W
OS Eastings: 301132
OS Northings: 211389
OS Grid: SO011113
Mapcode National: GBR YM.Y8M2
Mapcode Global: VH6CQ.D6YS
Plus Code: 9C3RQHR8+X2
Map layers use either open data or maps from the Ordnance Survey and Maptiler APIs.
Historic map layers are currently experimental and may not necessarily be available all the time.
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NLS (Historic)
Entry Name: Llwyn-on Reservoir dam, including valve house and spillway (partly in Vaynor Community)
Listing Date: 6 August 2002
Last Amended: 29 July 2009
Grade: II
Source: Cadw
Source ID: 26830
Building Class: Water Supply and Drainage
ID on this website: 300026830
Location: Prominently sited on the W side of the A470 Merthyr Tydfil to Brecon road approximately 6km NW of Merthyr Tydfil.
County: Rhondda Cynon Taff
Community: Hirwaun
Community: Hirwaun
Locality: Llwyn-on
Traditional County: Brecknockshire