Horse Mill, Chromate Quarry, Hagdale, Unst is a Grade B listed building in the Shetland Islands local planning authority area, Scotland. First listed on 30 March 1998. Horse-mill.

Horse Mill, Chromate Quarry, Hagdale, Unst

WRENN ID
eastward-gutter-jackdaw
Grade
B
Local Planning Authority
Shetland Islands
Constituency
Orkney and Shetland MP: Mr Alistair Carmichael (LD)
Country
Scotland
Date first listed
30 March 1998
Type
Horse-mill
OS grid reference
HP 640 102
Coordinates
60.77033, -0.82608
Source
Historic Environment Scotland listing

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

Description

The Horse Mill at Chromate Quarry in Hagdale, Unst, dates from around 1917 and is a single-storey circular structure that is now roofless. It features drystone rubble walls and has an entrance door on the south side. There is a tall window at eaves height on the north-northeast side, with matching windows positioned at right angles to the east and west, which correspond to openings for a shallow water channel. Internally, the walls have tapered flat edging stones at the base, and there is a circular lower millstone recessed in the center with a cast-iron stub. The wall also has a full-height check between the openings, and there is an overflow channel that curves around the south side of the mill.

Local climate

Horse Mill, Chromate Quarry, Hagdale, Unst sits in a wetter-than-average part of the UK, with an average of 1,160 mm of rain a year. This makes it wetter than 89% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.

It experiences an average of 4 freeze-thaw cycles a year, fewer than 98% of listed buildings. Of these, 4 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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