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OSBM Bolt 
OSBM Bolt on culvert [3GL]; OSBM BOLT CUL SE SIDE RD C DRAIN.
Location
Grid reference: NH 3633 0613.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1384.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Tarff,
6.77km to the northeast.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NH 3633 0613.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Culvert.
Waypoint: OS1384.
Neighbouring Flush Brackets
| G1043 | Loch Uanagan Farm 1.62km to the northeast. |
| G1044 | Railway Cottage 2.71km to the southwest. |
| G1042 | Fort Augustus 3.39km to the northeast. |
| G1045 | Bridge of Oich 3.74km to the southwest. |
| G1046 | Invergarry, Telephone Exchange 7.33km to the southwest. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on culvert.
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