Lock 39 Grand Union Canal is a Grade II listed building in the Buckinghamshire local planning authority area, England. First listed on 15 October 1984. Canal lock. 1 related planning application.

Lock 39 Grand Union Canal

WRENN ID
lone-mortar-azure
Grade
II
Local Planning Authority
Buckinghamshire
Constituency
Aylesbury MP: Laura Kyrke-Smith (Lab)
Country
England
Date first listed
15 October 1984
Type
Canal lock
Address
Lock 39 Grand Union Canal, Marsworth, HP23 4LJ
OS grid reference
SP 919 141
Coordinates
51.81841, -0.66678
Source
Historic England listing

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

Description

Lock 39 on the Grand Union Canal is a canal lock built around 1800, with some later repairs. The brick retaining walls were dated 1914 and feature stone coping. The lock has two pairs of gates equipped with sluices and winding gear, one of which has a quoin dated 1870. At the northern end, there are brick steps, and a single cast iron bollard is present. Additionally, there are two side ponds that are in working order, with winding gear dated 1865.

Local climate

Lock 39 Grand Union Canal sits in a drier-than-average part of the UK, with an average of 740 mm of rain a year. This makes it drier than 76% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 81% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 69% of listed buildings. Of these, 17 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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Nearby listed buildings

  1. Bridge Number 132 Grand Union Canal Grade II 20 m
  2. Lock Keepers House at Lock 39 Grand Union Canal Grade II 27 m
  3. Farmhouse at Startop Farm Grade II 182 m
  4. Canal House Grand Union Canal Aylesbury Arm Grade II 344 m
  5. The Old Manor Grade II 351 m
  6. Locks 1 and 2 Grand Union Canal Aylesbury Arm Grade II 372 m
  7. Horseshoe Cottage Grade II 378 m
  8. Bridge Number 1 Grand Union Canal Aylesbury Arm Grade II 402 m
  9. Lychgate Grade II 429 m
  10. Church of All Saints Grade II* 455 m