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OSBM Bolt 
OSBM Bolt on culvert, W side of road, 19' W of fence junction.
Location
Grid reference: TL 3839 2468.
Landranger 166: Luton & Hertford, Hitchin & St Albans.
Structure: Culvert.
Waypoint: OS0848.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Buntingford,
3.31km to the northwest.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Croydon to Buntingford levelling line. The surveyor's description was OSBM Bolt on culvert, W side of road, 19' W of fence junction.
Location
Grid reference: TL 3839 2468.
Landranger 166: Luton & Hertford, Hitchin & St Albans.
Structure: Culvert.
Waypoint: OS0848.
Neighbouring Flush Brackets
| 1297 | New Bridge 1.14km to the north. |
| 1296 | Puckeridge, High Street 1.31km to the south. |
| 1298 | A10 Railway Bridge 1.70km to the north. |
| G2043 | Standon 2.71km to the southeast. |
| 1295 | St Edmunds College 3.01km to the south. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Croydon to Buntingford levelling line. The surveyor's description was OSBM Bolt on culvert, W side of road, 19' W of fence junction.
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