Floodgate on East Side of Knott Mill Bridge is a Grade II listed building in the Manchester local planning authority area, England. First listed on 6 June 1994. A C18 Floodgate.

Floodgate on East Side of Knott Mill Bridge

WRENN ID
open-hall-myrtle
Grade
II
Local Planning Authority
Manchester
Constituency
Manchester Central MP: Lucy Powell (Lab)
Country
England
Date first listed
6 June 1994
Type
Floodgate
Address
Floodgate on East Side of Knott Mill Bridge, Deansgate
OS grid reference
SJ 833 974
Coordinates
53.47338, -2.25201
Source
Historic England listing

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

Description

The floodgate on the east side of Knott Mill Bridge in Manchester is a structure likely built around 1765 by James Brindley for the Duke of Bridgewater. It has been altered in the 19th and 20th centuries. Made of stone, this floodgate is part of the hydraulic system that allowed the Bridgewater Canal terminus basin to utilize the River Medlock. The river was diverted through a culvert from this location to Potato Wharf, and the canal overflow was returned to the river via a weir known as the Giant's Basin. This simple structure holds national historical importance. It is associated with other significant features, including the culvert arches on New Elm Road and the Giant's Basin at Potato Wharf.

Local climate

Floodgate on East Side of Knott Mill Bridge sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 77% of listed buildings.

It experiences an average of 43 freeze-thaw cycles a year, more than 81% of listed buildings. Of these, 23 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

Sign in or create a free account to unlock:

  • 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
Create free account

Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.

Similar buildings

The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.

See all similar buildings →

this building   1 similar   nearby listed buildings

Nearby listed buildings

  1. Boundary Stone on Knott Mill Bridge Grade II 5 m
  2. Electricity Junction Box in Castlefield canal basin, Manchester Grade II 65 m
  3. Electricity Junction Box in Castlefield canal basin, Manchester Grade II 89 m
  4. Former Congregational Chapel Grade II 103 m
  5. Deansgate Station Grade II 110 m
  6. Electricity Junction Box on Castle Street, Manchester Grade II 148 m
  7. Rochdale Canal Lock Number 91 at East End of Gaythorn Tunnel Grade II 156 m
  8. Rochdale Canal Lock Keepers Cottage at Lock Number 91, Next to Gaythorn Tunnel Grade II 160 m
  9. Bridgewater Canal Offices Grade II 196 m
  10. Castlefield Railway Viaduct from G-Mex to Dawson Street Grade II 239 m