1GL Bolt: Alport Bridge   

Bolt in North face of South battlement of Alport Bridge ; 1.97 ft. below top of battlement [1GL, Thorne to Staleybridge, Mark No. 254]; BOLT BR PARA S SIDE RD C BR (242.4532m ODN, 0.2m AGL).

Location
Grid reference: SK 1413 8955.
Landranger 110: Sheffield & Huddersfield, Glossop & Holmfirth.
Structure: Bridge.
Waypoint: BT0998.

Neighbouring Bench Marks

BOLT	Cutthroat Bridge 7.55km to the east.
BM	Strines Inn 8.19km to the east.
BM	Strines Inn 8.20km to the east.
BM	NE of Bettfield farm 8.73km to the southwest.
BM	Roych Clough 8.75km to the southwest.

The nearest fundamental bench mark is Broomhead Moor, 11.59km to the northeast.

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 795.5310 feet [242.4778 metres] above mean sea level (Liverpool datum). It was included on the Thorne to Staleybridge levelling line. The surveyor's description was Bolt in North face of South battlement of Alport Bridge ; 1.97 ft. below top of battlement.