Entrance Lock to the Tamar Manure Navigation is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 19 October 1987. Canal lock.
Entrance Lock to the Tamar Manure Navigation
- WRENN ID
- sunken-gable-mist
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- South East Cornwall MP: Anna Gelderd (Lab)
- Country
- England
- Date first listed
- 19 October 1987
- Type
- Canal lock
- Address
- Entrance Lock to the Tamar Manure Navigation, Weir Head, Calstock
- OS grid reference
- SX 435 708
- Coordinates
- 50.51639, -4.2088
- Source
- Historic England listing
Description
The entrance lock to the Tamar Manure Navigation is located at the southern entrance of the navigation, with remains of the entrance lock found at the northern end. It is dated to 1798, although it is believed to have been constructed in 1808. The lock features granite ashlar walls and includes one pair of wooden lock gates equipped with iron winding gear for the sluices.
The lock basin measures approximately 25 metres in length, with the gates situated at the southern end. The granite ashlar walls are splayed back at each end of the lock basin, and the lock gates are partially collapsed. There is a granite mooring post at the south end, and the iron winding gear for the sluices is still present. At the northern end of the canal, the granite ashlar walls remain, but there are no gates.
The canal was originally built for the Tamar Coal Manure and General Mercantile Company and was diverted and shortened by the Duke of Bedford in the early 20th century. It continued to be used for supplying coal to the Gunnislake Gas Works until 1914. The company was liquidated in 1942, and the canal is listed as an Ancient Monument.
Local climate
Entrance Lock to the Tamar Manure Navigation sits in a wetter-than-average part of the UK, with an average of 1,000 mm of rain a year. This makes it wetter than 80% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 81% of listed buildings.
It experiences an average of 17 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 7 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
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