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OSBM Bolt 
OSBM Bolt on parapet of bridge, SW side of road, 28' NW from centre of stream.
Location
Grid reference: SJ 1613 5878.
Landranger 116: Denbigh & Colwyn Bay.
Structure: Unknown.
Waypoint: OS0531.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Wrexham,
11.21km to the southeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Dyserth to Wrexham levelling line. The surveyor's description was OSBM Bolt on parapet of bridge, SW side of road, 28' NW from centre of stream.
Location
Grid reference: SJ 1613 5878.
Landranger 116: Denbigh & Colwyn Bay.
Structure: Unknown.
Waypoint: OS0531.
Neighbouring Flush Brackets
| G2929 | Bwlch-y-parc 777.95m to the southeast. |
| G2928 | Llanbedr-Dyffryn-Clwyd 1.28km to the west. |
| G2930 | Tyddyn-Draw 2.02km to the east. |
| G2931 | Cyfnant-Ganol 2.61km to the east. |
| G2927 | Ruthin, Bryn-Rhos 2.87km to the west. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Dyserth to Wrexham levelling line. The surveyor's description was OSBM Bolt on parapet of bridge, SW side of road, 28' NW from centre of stream.
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