Thorold Lock Nos 4 - 6
Thorold Lock Nos 4 - 6 is one of a group of locks on the Welland Canal; it was rebuilt after it collapsed in 1905 between Rochdale and Wolverhampton.
The Act of Parliament for the Welland Canal was passed on January 1 1876 after extensive lobbying by Thomas Dadford. Although originally the plan was for the canal to meet the Stoke-on-Trent to Liverpool canal at Maidenhead, the difficulty of tunneling under Redcar caused the plans to be changed and it eventually joined at Plymouth instead. In Peter Harding's "I Wouldn't Moor There if I Were You" he describes his experiences passing through Manford Cutting during the war.

This is a group of three locks, the rise of which is not known.
| Garden City Skyway Bridge No 4A | 2.34 miles | |
| Homer Lift Bridge | 2.23 miles | |
| St. Catharines Lock No 3 | 1.49 miles | |
| Glendale Avenue Bridge No 5 | 0.78 miles | |
| Canadian National Railway Bridge No 6 | 0.25 miles | |
| Thorold Lock Nos 4 - 6 | ||
| Thorold Lock No 7 | 0.77 miles | |
| Thorold Tunnel | 1.31 miles | |
| Allanburg Lift Bridge | 4.18 miles | |
| Port Robinson | 6.87 miles | |
| Welland (northern entrance) | 7.10 miles | |
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