North Grove Lock is a Grade II listed building in the Three Rivers local planning authority area, England. First listed on 3 October 1985. Lock.
North Grove Lock
- WRENN ID
- tired-screen-rain
- Grade
- II
- Local Planning Authority
- Three Rivers
- Constituency
- South West Hertfordshire MP: Mr Gagan Mohindra (Con)
- Country
- England
- Date first listed
- 3 October 1985
- Type
- Lock
- Address
- North Grove Lock, 71, Grand Union Canal, Abbots Langley
- OS grid reference
- TL 079 012
- Coordinates
- 51.6995, -0.43885
- Source
- Historic England listing
Description
North Grove Lock, also known as Lock No. 71 on the Grand Union Canal, dates from around 1797 when it was originally part of the Grand Junction Canal, which became the Grand Union Canal following an amalgamation in 1919. The lock features dates of 1869 on the hinge of the south gate and 1881 on the hinge of the north gate, which may indicate repairs or components taken from other lock gates. It is constructed of brick with stone setts capping the revetment on the west side, and it has timber gates. There are also timber and iron bollards, likely cast in 1896 by the London and Lancashire Engineering Company. The lock measures 88 feet by 16 feet, designed to accommodate narrow boats in pairs. This structure is included for its group value with the nearby North Grove Lock House on Watford Road.
Local climate
North Grove Lock 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 86% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 85% of listed buildings.
It experiences an average of 31 freeze-thaw cycles a year, fewer than 61% 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.
More on this building
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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
- 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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