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OSBM Bolt: by Allt Briste 
OSBM Bolt on concrete sump; OSBM BOLT CONCRETE TK 1.1M E SIDE RD 10.9M S PRODN WALL.
Location
Grid reference: ND 0358 1700.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Unknown.
Waypoint: OS1953.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Helmsdale,
1.30km 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 Lybster to Helmsdale levelling line. The surveyor's description was OSBM Bolt on concrete sump.
Location
Grid reference: ND 0358 1700.
Landranger 17: Helmsdale & Strath of Kildonan.
Structure: Unknown.
Waypoint: OS1953.
Neighbouring Flush Brackets
| G1987 | Helmsdale, Church 1.68km to the southwest. |
| G1988 | Helmsdale, Church 1.97km to the southwest. |
| G1989 | Portgower, Old School House 4.65km to the southwest. |
| G2097 | Ousdale School 5.15km to the northeast. |
| G4371 | Westgarty Lodge 6.46km to the southwest. |
Third Geodetic Levelling, Scotland (1956-68)
This bench mark was used during the Third geodetic levelling, Scotland. It was included on the Lybster to Helmsdale levelling line. The surveyor's description was OSBM Bolt on concrete sump.
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