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OSBM Bolt 
OSBM Bolt on bridge parapet.
Location
Grid reference: NC 5034 0169.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS2016.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1946),
8.96km 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 Ledmore to Lairg levelling line. The surveyor's description was OSBM Bolt on bridge parapet.
Location
Grid reference: NC 5034 0169.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS2016.
Neighbouring Flush Brackets
| G1919 | Achuirghill 1.06km to the west. |
| G1918 | The Firs 2.03km to the west. |
| G1917 | Invercassley, West Lodge 3.08km to the west. |
| G1920 | Claonel 6.94km to the northeast. |
| G1851 | Achinduich 7.95km to the east. |
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 bridge parapet.
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