Nash Mills Lock on Grand Union Canal is a Grade II listed building in the Dacorum local planning authority area, England. First listed on 2 December 1986. Canal lock.

Nash Mills Lock on Grand Union Canal

WRENN ID
sleeping-beam-gold
Grade
II
Local Planning Authority
Dacorum
Constituency
Hemel Hempstead MP: David Taylor (Lab)
Country
England
Date first listed
2 December 1986
Type
Canal lock
Address
Nash Mills Lock on Grand Union Canal, Red Lion Lane, Kings Langley
OS grid reference
TL 068 045
Coordinates
51.72972, -0.45381
Source
Historic England listing

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

Description

Nash Mills Lock on the Grand Union Canal is a canal lock built around 1797 as part of the Grand Junction Canal Company, which later became the Grand Union Canal in 1929. The iron hinge on the upper gate is dated 1877, indicating possible repairs at that time. The lock features early 20th century steps and revetment at the lower gate. It is constructed from brick and stone masonry, with brown engineering brick steps and revetment at the lower gate. The wooden gates have steel extensions to the beams. The lock measures 88 feet by 16 feet, designed to accommodate narrow boats in pairs. There are gate and ground paddles for the upper gates, and gate paddles only for the lower gates. The eastern half of the lock is located in Abbots Langley civil parish in Three Rivers District.

Local climate

Nash Mills Lock on Grand Union Canal sits in a drier-than-average part of the UK, with an average of 720 mm of rain a year. This makes it drier than 84% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 83% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 54% of listed buildings. Of these, 15 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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