Boundary Stone at Ngr Sy 7035 7208 is a Grade II listed building in the Dorset local planning authority area, England. First listed on 17 May 1993. Boundary marker.

Boundary Stone at Ngr Sy 7035 7208

WRENN ID
low-flagstone-onyx
Grade
II
Local Planning Authority
Dorset
Constituency
South Dorset MP: Lloyd Hatton (Lab)
Country
England
Date first listed
17 May 1993
Type
Boundary marker
Address
Boundary Stone at Ngr Sy 7035 7208, the Grove, Portland
OS grid reference
SY 703 720
Coordinates
50.54766, -2.41969
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

This boundary stone, likely dating from around 1870, is a single block of Portland stone measuring approximately 350 millimeters square and 700 millimeters high, with a rounded top. It is inscribed on the south side with a War Department arrow, an anchor, and the number 74. This stone is one of several markers from the War Department or Admiralty located on the island. It is situated about 180 meters south of the bend at the eastern end of The Grove, positioned along a footpath that runs next to a boundary wall at the cliff edge.

Local climate

Boundary Stone at Ngr Sy 7035 7208 receives an average of 840 mm of rain a year. This makes it wetter than 55% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 77% of listed buildings.

It experiences an average of 13 freeze-thaw cycles a year, fewer than 88% of listed buildings. Of these, 5 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

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  • Radon risk assessment
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