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OSBM Bolt 
OSBM Bolt on culvert [3GL]; OSBM BOLT CUL SE SIDE RD.
Location
Grid reference: NN 2313 8881.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Landranger 41: Ben Nevis, Fort William & Glen Coe.
Structure: Culvert.
Waypoint: OS1374.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Spean Bridge,
6.96km to the south.
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: NN 2313 8881.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Landranger 41: Ben Nevis, Fort William & Glen Coe.
Structure: Culvert.
Waypoint: OS1374.
Neighbouring Flush Brackets
| G1050 | Letterfinlay 3.42km to the northeast. |
| G1051 | Rathliesbeag 4.24km to the southwest. |
| G1052 | Allt Mairi 5.40km to the southwest. |
| G1053 | Spean Bridge 7.14km to the south. |
| G1054 | Inverroy 7.68km to the south. |
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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