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OSBM Bolt: by Loch Uanagan 
OSBM Bolt on top of bridge [3GL]; OSBM BOLT BR BUTT E SIDE DIS RLY N SIDE STR - presumably replacement for FB G1047 nearby.
Location
Grid reference: NH 3715 0740.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Bridge.
Waypoint: OS1385.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Loch Tarff,
5.47km 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 Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on top of bridge.
Location
Grid reference: NH 3715 0740.
Landranger 34: Fort Augustus, Glen Albyn & Glen Roy.
Structure: Bridge.
Waypoint: OS1385.
Neighbouring Flush Brackets
| G1043 | Loch Uanagan Farm 111.80m to the northeast. |
| G1042 | Fort Augustus 1.88km to the northeast. |
| G1044 | Railway Cottage 4.22km to the southwest. |
| G1045 | Bridge of Oich 5.22km to the southwest. |
| G1041 | Portclair Burn Bridge 7.56km 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 Spean Bridge to Loch Tarff levelling line. The surveyor's description was OSBM Bolt on top of bridge.
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