1GL Bolt: Bridgwater, St John's Church   

St. John's Church, Bridgewater. Bolt in W. side of tower at doorway ; 3.37 ft. above surface [1GL, Bristol to Plymouth, Branch Levelling from Mark No. 89(a)]; PA BOLT ST JOHNS CH N SIDE BLAKE PLACE N BUTT SW FACE (7.9602m ODN, 0.9M AGL).

Location
Grid reference: ST 3030 3733.
Landranger 182: Weston-super-Mare, Bridgwater & Wells.
Structure: Church.
Waypoint: BT1239.

Neighbouring Bench Marks

BOLT	Bridgwater, St Mary's Church 612.94m to the southwest.
BM	Bridgwater, St Mary's Church 612.94m to the southwest.
BOLT	Wembdon, Church 1.51km to the northwest.
BOLT	North Petherton, Church 4.50km to the south.
RIVET	Hinkley Point, Tide Gauge Aux 1 13.05km to the northwest.

The nearest fundamental bench mark is North Petherton, 4.44km to the southwest.

First Primary Levelling, England & Wales (1840-60)
This bench mark was used during the First primary levelling, England & Wales, and was levelled with a height of 26.4800 feet [8.0711 metres] above mean sea level (Liverpool datum). It was included as a side level on the Bristol to Plymouth levelling line. The surveyor's description was St. John's Church, Bridgewater. Bolt in W. side of tower at doorway ; 3.37 ft. above surface.

Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales.