SP5968 : Lock No 4 at the Watford staircase in Northamptonshire

taken 9 years ago, near to Watford, Northamptonshire, Great Britain

Lock No 4 at the Watford staircase in Northamptonshire
Lock No 4 at the Watford staircase in Northamptonshire
Grand Union Canal (Leicester Section).
The Watford flight of locks in Northamptonshire contains seven locks, including one staircase of four. The total rise in water level provided is 52ft 6in (16 metres).

This image shows the second lock up in the staircase (Lock No 4), with its sidepond. In this kind of staircase a lot of water is conserved by correct use of the red paddles connecting the locks to the sideponds.

SP5968 : What are these side pounds for?

Jo Turner writes:
Staircase locks

In a staircase the upper gate of one lock is also the lower gate of the one above it. Operating a staircase is very different from operating a flight. It can be more useful to think of a staircase as a single lock with intermediate levels. As there is no intermediate pound, a chamber can only be filled by emptying the one above, or emptied by filling the one below; thus the whole staircase has to be full of water (except for the bottom chamber) before a boat starts to ascend, or empty (except for the top chamber) before a boat starts to descend. In an apparent staircase the chambers still have common gates, but the water does not pass directly from one chamber to the next, going instead via side ponds. This means it is not necessary to ensure that the flight is full or empty before starting. Examples of real staircases are Bingley and Grindley Brook. Examples of apparent staircase locks are Foxton Locks and Watford Locks on the Leicester Branch of the Grand Union.

Creative Commons Licence [Some Rights Reserved]   © Copyright Roger Kidd and licensed for reuse under this Creative Commons Licence.
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
TIP: Click the map for Large scale mapping
Change to interactive Map >
Grid Square
SP5968, 205 images   (more nearby search)
  (find more nearby)
Date Taken
Thursday, 22 August, 2013   (more nearby)
Sunday, 5 August, 2018
Geographical Context
Subject Location
OSGB36: geotagged! SP 5922 6877 [10m precision]
WGS84: 52:18.8312N 1:7.9633W
Camera Location
OSGB36: geotagged! SP 5928 6877
View Direction
WEST (about 270 degrees)
Looking for a postcode? Try this pageExternal link
Clickable map

Other Tags
Staircase Locks 

Click a tag, to view other nearby images.

Image Type (about): geograph 
This page has been viewed about 20 times.
View this location: KML (Google Earth) · Google MapsExternal link · Bing MapsExternal link · Geograph Coverage Map · geotagged! More Links for this image
W Go E
thumbs up icon
You are not logged in login | register