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OSBM Bolt 
OSBM Bolt on culvert [3GL].
Location
Grid reference: NH 3989 1155.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1697.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Tarff,
3.11km to the southeast.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Glen Moriston to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NH 3989 1155.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1697.
Neighbouring Flush Brackets
| G1041 | Portclair Burn Bridge 2.60km to the northeast. |
| G1042 | Fort Augustus 3.13km to the southwest. |
| G1043 | Loch Uanagan Farm 4.86km to the southwest. |
| G1040 | Invermoriston 5.66km to the north. |
| G4537 | Levishie Burn Bridge 6.00km to the north. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Glen Moriston to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
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