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OSBM Bolt 
OSBM Bolt on culvert [3GL]; OSBM BOLT CUL 2.1M NE RD.
Location
Grid reference: NC 3520 0220.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS2009.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
15.52km to the northwest.
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NC 3520 0220.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS2009.
Neighbouring Flush Brackets
| G1884 | Lubcroy 483.32m to the southeast. |
| G1885 | Oykel, School/Post Office 2.04km to the southeast. |
| G1886 | Oykel Bridge 3.62km to the east. |
| G1883 | Allt Eileag Bridge 6.52km to the northwest. |
| G4385 | Altnacealgach Hotel 12.18km to the northwest. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt on culvert.
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