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OSBM Bolt: Milford Haven Tide Gauge 
Tide Gauge Bolt at root of pier, E side of E gate, 8' W of SE angle of fence, 3' W of fence junction.
Location
Grid reference: SM 9184 0489.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0912.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Haverfordwest (1969),
11.90km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was Tide Gauge Bolt at root of pier, E side of E gate, 8' W of SE angle of fence, 3' W of fence junction.
Location
Grid reference: SM 9184 0489.
Landranger 157: St David's & Haverfordwest.
Landranger 158: Tenby & Pembroke.
Structure: Unknown.
Waypoint: OS0912.
Neighbouring Flush Brackets
| G5100 | Milford Haven, Pill Road 1.64km to the northwest. |
| G4919 | West Popton Farm 1.99km to the southwest. |
| G4977 | Milford Haven Tide Gauge Aux 1 2.71km to the west. |
| G5099 | Steynton 2.92km to the north. |
| G5101 | Rhoscrowther 3.12km to the southwest. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Haverfordwest to Carmarthen levelling line. The surveyor's description was Tide Gauge Bolt at root of pier, E side of E gate, 8' W of SE angle of fence, 3' W of fence junction.
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