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OSBM Bolt 
OSBM Bolt on culvert [3GL]; OSBM BOLT CUL SW SIDE RD.
Location
Grid reference: NC 3433 0283.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS2008.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
14.47km 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 3433 0283.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS2008.
Neighbouring Flush Brackets
| G1884 | Lubcroy 1.51km to the southeast. |
| G1885 | Oykel, School/Post Office 3.11km to the southeast. |
| G1886 | Oykel Bridge 4.67km to the southeast. |
| G1883 | Allt Eileag Bridge 5.48km to the northwest. |
| G4385 | Altnacealgach Hotel 11.12km 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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