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OSBM Bolt 
OSBM Bolt on bridge parapet.
Location
Grid reference: NC 5749 1394.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS1712.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
6.31km 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 Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt on bridge parapet.
Location
Grid reference: NC 5749 1394.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS1712.
Neighbouring Flush Brackets
| S7768 | Colaboll ? 3.88km to the southwest. |
| S7767 | by West Shinness 4.82km to the west. |
| G1849 | Lairg, Sutherland Arms Hotel 7.62km to the south. |
| G1921 | Lairg, Bridge End House 7.96km to the south. |
| G1920 | Claonel 9.41km 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 Lairg to Loch Naver levelling line. The surveyor's description was OSBM Bolt on bridge parapet.
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