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OSBM Bolt 
OSBM Bolt on bridge parapet.
Location
Grid reference: NC 5632 1662.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS1714.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Lairg (1950),
9.03km 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 5632 1662.
Landranger 16: Lairg & Loch Shin, Loch Naver.
Structure: Bridge.
Waypoint: OS1714.
Neighbouring Flush Brackets
| S7767 | by West Shinness 3.69km to the west. |
| S7768 | Colaboll ? 6.22km to the south. |
| G2059 | Crask Inn 9.02km to the northwest. |
| S7766 | Fiag Bridge 10.33km to the west. |
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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