Main Gatehouse and Bridge at Admiralty Compass Observatory, at Ditton Park is a Grade II listed building in the Windsor and Maidenhead local planning authority area, England. First listed on 26 April 1984. Gatehouse, bridge.

Main Gatehouse and Bridge at Admiralty Compass Observatory, at Ditton Park

WRENN ID
sombre-keystone-moss
Grade
II
Local Planning Authority
Windsor and Maidenhead
Constituency
Windsor MP: Jack Rankin (Con)
Country
England
Date first listed
26 April 1984
Type
Gatehouse, bridge
Address
Main Gatehouse and Bridge at Admiralty Compass Observatory, at Ditton Park, Ditton Park Road, Datchet
OS grid reference
TQ 001 779
Coordinates
51.49172, -0.55921
Source
Historic England listing

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

Description

The main gatehouse and bridge at the Admiralty Compass Observatory in Ditton Park is a 18th-century structure. The gatehouse is rendered brick and features towers with turrets, crenellations, and lancet windows flanking an arched gateway. An 18th-century brick bridge provides access over the moat and is complemented by a simple iron balustrade.

Local climate

Main Gatehouse and Bridge at Admiralty Compass Observatory, at Ditton Park sits in a drier-than-average part of the UK, with an average of 710 mm of rain a year. This makes it drier than 87% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 82% of listed buildings.

It experiences an average of 32 freeze-thaw cycles a year, fewer than 59% of listed buildings. Of these, 13 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.

More on this building

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  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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