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OSBM Bolt: Yafforth Moor 
OSBM Bolt on concrete block, SE side of Thrincroft Lane, 10' NW of hedge & 68' SW from angle of hedge, Yafforth Moor [3GL].
Location
Grid reference: SE 3303 9567.
Landranger 99: Northallerton & Ripon, Pateley Bridge & Leyburn.
Structure: Concrete block.
Waypoint: OS0648.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Northallerton,
9.95km to the east.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Forcett to Northallerton levelling line. The surveyor's description was OSBM Bolt on concrete block, SE side of Thrincroft Lane, 10' NW of hedge & 68' SW from angle of hedge, Yafforth Moor.
Location
Grid reference: SE 3303 9567.
Landranger 99: Northallerton & Ripon, Pateley Bridge & Leyburn.
Structure: Concrete block.
Waypoint: OS0648.
Neighbouring Flush Brackets
| 2162 | Manor Cottage 1.10km to the northwest. |
| 2161 | Yafforth, Field House 1.19km to the southeast. |
| 2167 | by Sweden Sykes 1.67km to the northwest. |
| 2160 | Yafforth Bridge 2.00km to the southeast. |
| G3192 | Danby Wiske, Oak House 2.50km 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 Forcett to Northallerton levelling line. The surveyor's description was OSBM Bolt on concrete block, SE side of Thrincroft Lane, 10' NW of hedge & 68' SW from angle of hedge, Yafforth Moor.
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