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OSBM Bolt 
OSBM Bolt on culvert, 44' SW from stream centre, NW side of road [3GL]; OSBM BOLT 13.4M SW C STR NW SIDE RD.
Location
Grid reference: SS 5696 9045.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Culvert.
Waypoint: OS0767.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Bishopston,
1.22km 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 Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on culvert, 44' SW from stream centre, NW side of road.
Location
Grid reference: SS 5696 9045.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Culvert.
Waypoint: OS0767.
Neighbouring Flush Brackets
| G3819 | Kittle Hill Farm 704.06m to the south. |
| S1178 | Vennaway 1.03km to the southwest. |
| S1177 | Kilvrough Farm 1.41km to the southwest. |
| G3818 | Northway 1.86km to the southeast. |
| G3820 | Ty Bach 2.65km to the north. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on culvert, 44' SW from stream centre, NW side of road.
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