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OSBM Bolt 
OSBM Bolt on culvert [3GL] - presumably replaced in 1975 by FB 11786 nearby.
Location
Grid reference: NC 1739 0596.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS1821.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Ledmore,
10.36km 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 Ullapool to Ledmore levelling line. The surveyor's description was OSBM Bolt on culvert.
Location
Grid reference: NC 1739 0596.
Landranger 15: Loch Assynt, Lochinver & Kylesku.
Structure: Culvert.
Waypoint: OS1821.
Neighbouring Flush Brackets
| 11786 | By An Leth-allt 176.92m to the northeast. |
| G1874 | River Runie Bridge 1.02km to the southwest. |
| 11789 | By Feur Loch 1.66km to the northeast. |
| G1877 | Drumrunie Lodge 2.17km to the southwest. |
| 12091 | Knockanrock 2.88km 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 Ullapool to Ledmore levelling line. The surveyor's description was OSBM Bolt on culvert.
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