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Cut Mark: Gainsbrough Bridge 
Old B.M. on centre of N. side of Gainsborough Bridge (Toll) [2GL] - estimated location; NOT the same as PARA REBUILT 1992/3 REVALUED BY ECS LTD 10.370M) NBM PARA GAINSBOROUGH BR N SIDE RD W SIDE R TRENT (10.3723m, 0.5m AGL, verified 1967) at SK 8141 8906; note that tolls on this bridge were abolished in 1932.
Location
Grid reference: SK 8145 8908.
Landranger 112: Scunthorpe & Gainsborough.
Landranger 121: Lincoln & Newark-on-Trent.
Structure: Bridge.
Waypoint: BM2627.
Neighbouring Bench Marks
The nearest fundamental bench mark is Hibaldstow (1987),
17.44km to the northeast.
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 36.7370 feet [11.1974 metres] above mean sea level (Newlyn datum). It was included as a side level on the Hibaldstow to Matlock levelling line. The surveyor's description was Old B.M. on centre of N. side of Gainsborough Bridge (Toll).
Location
Grid reference: SK 8145 8908.
Landranger 112: Scunthorpe & Gainsborough.
Landranger 121: Lincoln & Newark-on-Trent.
Structure: Bridge.
Waypoint: BM2627.
Neighbouring Bench Marks
| BM | Gainsborough, Holy Trinity Church 424.26m to the northeast. |
| BM | Saundby, Hall Farm 3.21km to the west. |
| BOLT | Beckingham, All Saints Church 3.77km to the west. |
| BM | Upton, All Saints Church 5.88km to the southeast. |
| BM | Blyton, Sandbeck Lane corner 6.65km to the northeast. |
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 36.7370 feet [11.1974 metres] above mean sea level (Newlyn datum). It was included as a side level on the Hibaldstow to Matlock levelling line. The surveyor's description was Old B.M. on centre of N. side of Gainsborough Bridge (Toll).
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