1GL Bolt: Bridgwater, St Mary's Church   

Bolt in South corner of East end of Saint Mary's Church, Bridgewater ; 1.51 ft. above surface [1GL, Bristol to Plymouth, Mark No. 91(a)]; Bolt in South corner of East end of St. Mary's Church, Bridgewater ; 1.51 ft. above surface [1GL, Bridgewater to Plymouth, Mark No. 1]; PA BOLT BUTT ST MARYS CH SE FACE SE ANG (12.5821m ODN, 0.5m AGL).

Location
Grid reference: ST 2979 3699.
Landranger 182: Weston-super-Mare, Bridgwater & Wells.
Structure: Church.
Waypoint: BT0708.

Neighbouring Bench Marks

BM	Bridgwater, St Mary's Church 0.00m to the east.
BOLT	Bridgwater, St John's Church 612.94m to the northeast.
BOLT	Wembdon, Church 1.30km to the northwest.
BOLT	North Petherton, Church 4.05km to the south.
RIVET	Hinkley Point, Tide Gauge Aux 1 12.93km to the northwest.

The nearest fundamental bench mark is North Petherton, 3.93km to the south.

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 41.4800 feet [12.6431 metres] above mean sea level (Liverpool datum). It was included on the Bridgewater to Plymouth and Bristol to Plymouth levelling lines. The surveyor's description was Bolt in South corner of East end of Saint Mary's Church, Bridgewater ; 1.51 ft. above surface [1GL, Bristol to Plymouth, Mark No. 91(a)]; Bolt in South corner of East end of St. Mary's Church, Bridgewater ; 1.51 ft. above surface [1GL, Bridgewater to Plymouth, Mark No. 1].