Which are the deepest canal locks in the country?
For comparison, this page lists those non-tidal canal and river locks that have a fall of over 11 feet.
| Lock name | Number | Canal | Depth | Other information | |
| Tuel Lane Lock | 3/4 | Rochdale | 19' 8½" | 6.00m | manned, new lock replacing two locks |
| Bath Deep Lock | 8/9 | Kennet and Avon | 19' 5" | 5.92m | new lock replacing two locks |
| Anthony Lock | 77 | Rochdale | 15' 1½" | 4.61m | deepened due to mining subsidence |
| Vinegar Lock | 10 | Ashton | 13' 10" | 4.22m | part of the Clayton flight |
| Lemonroyd Lock | Aire and Calder | 13' 6" | 4.11m | new lock replacing two locks | |
| Woodnook Lock | Aire and Calder | 13' 6" | 4.11m | new lock replacing Altofts and Fairies Hill Locks | |
| Etruria Top Lock | 40 | Trent and Mersey | 13' 2" | 4.01m | at southern end of T&M summit |
| Marple Locks | 1-16 | Peak Forest | 13' 0½" | 3.98m | 16 locks, total fall of 209 ft, average 13' 0½" each |
| Clayton Lock | 8 | Ashton | 12' 9" | 3.89m | part of the Clayton flight |
| Stourport Broad Locks | Staffordshire and Worcestershire | 12' 4" | 3.76m | linking Stourport Basin with River Severn, two broad locks, total fall 24' 8", average 12' 4" each | |
| Stenson Lock | 6 | Trent and Mersey | 12' 2" | 3.71m | |
| Somerton Deep Lock | 34 | Southern Oxford | 12' 0" | 3.66m | |
| Holme Lock | River Trent | 12' 0" | 3.66m | manned | |
| Blowers Green Lock | Stourbridge | 12' 0" | 3.66m | deepest lock on BCN, replaced two locks | |
| York Street Lock | Staffordshire and Worcestershire | 12' 0" | 3.66m | linking canal with Stourport Basin | |
| Appley Lock | 91 | Leeds and Liverpool | 12' 0" | 3.66m | parallel to two shallower (now disused) locks |
| Bingley Five Rise | 25-29 | Leeds and Liverpool | 12' 0" each | 3.66m | 5 locks in a staircase, total rise 60', therefore 12' 0" each lock |
| Kidderminster Lock | Staffordshire and Worcestershire | 11' 10" | 3.6m | ||
| Tardebigge Top Lock | 58 | Worcester and Birmingham | 11' 7" | 3.53m | replaced an earlier vertical lift - sometimes incorrectly claimed to be 14ft |
| Cholmondeston Lock | 1 | Middlewich Branch, Shropshire Union | 11' 3" | 3.43m | |
| Hunts Lock | 2 | River Weaver | 11' 2" | 3.4m | |
| Denham Deep Lock | 87 | Grand Union Canal South | 11' 1" | 3.38m | |
| Stanthorne Lock | 3 | Middlewich Branch, Shropshire Union | 11' 1" | 3.38m | |
| Minshull Lock | 2 | Middlewich Branch, Shropshire Union | 11' 0" | 3.35m | |
| Northgate Locks, Chester | 2 | Shropshire Union | 11' 0" | 3.35m | 3 locks in a staircase, total rise 33', therefore 11' 0" each lock |
Tuel Lane Lock
Anthony Lock
Vinegar Lock
On the Manchester Ship Canal, not part of the network available to the casual canal boater, Latchford, Irlam, Barton and Mode Wheel locks each have a fall of 14' 6" (4.41m).
Upper chamber at Ardnacrusha
This page lists deep locks in England, but it is worth mentioning Ardnacrusha in the Republic of Ireland. A dam has been constructed across the River Shannon at Ardnacrusha, as part of a hydro-electric generation scheme. The river navigation bypasses the dam in a canal channel that has a double lock (two-rise lock staircase) with a total fall of 102 feet (31m)! The two chambers each have a fall of around 68 ft and 34 ft. Passage through the double lock can take between 45 and 60 minutes.
The deepest lock in the world is Oskemen Lock, bypassing a hydro-electric dam on the River Ertis in Kazakhstan, with an incredible fall of 138 ft (42m).
