Lock Walls and Basin Wall at Entrance of Somersetshire Coal Canal South of Basin at West of Dundas Aqueduct is a Grade II listed building in the Bath and North East Somerset local planning authority area, England. First listed on 21 January 1987. Lock, basin wall.

Lock Walls and Basin Wall at Entrance of Somersetshire Coal Canal South of Basin at West of Dundas Aqueduct

WRENN ID
vacant-hinge-fern
Grade
II
Local Planning Authority
Bath and North East Somerset
Constituency
Frome and East Somerset MP: Anna Sabine (LD)
Country
England
Date first listed
21 January 1987
Type
Lock, basin wall
Address
Lock Walls and Basin Wall at Entrance of Somersetshire Coal Canal South of Basin at West of Dundas Aqueduct, Monkton Combe
OS grid reference
ST 783 624
Coordinates
51.36107, -2.31214
Source
Historic England listing

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

Description

The lock walls and basin wall at the entrance of the Somersetshire Coal Canal, located south of the basin at the west of the Dundas Aqueduct, are a former entrance lock and basin wall built in the early 19th century, with canal construction beginning in 1801. The Surveyor for the Coal Canal Company was William Smith, known as the 'Father of British Geology'. The structure is made of ashlar and measures about 20 metres long and 2.5 metres wide. The former entrance lock, which no longer has gates, features three deep courses down to the water level, with cap stones that are deeply worn from traffic. There are visible gate recesses, and to the east, three deeper recesses have been inserted. At the south end, the east wall curves around and continues as a basin wall, which is now capped with 20th-century timbers for an additional 50 metres. The canal was closed in 1904, and the lock was backfilled but was re-excavated in 1985 for use as a marina for boats using the Kennet and Avon Canal.

Local climate

Lock Walls and Basin Wall at Entrance of Somersetshire Coal Canal South of Basin at West of Dundas Aqueduct receives an average of 850 mm of rain a year. This makes it wetter than 59% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 63% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 55% of listed buildings. Of these, 14 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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