Locks: Grand Union Canal North 1 - 23

 Grand Union Main Line Northern section, locks 1 - 23: Napton to Warwick

The Grand Union Canal Main Line runs for 137 miles through 166 locks from Brentford on the River Thames to Salford Junction in the north east of Birmingham. All the locks are double width locks except the final 11 locks in Birmingham. The locks on the Knowle flight are the first double width locks heading south from Birmingham.

The Grand Union Canal was formed in 1929 from many separate canal systems. The Main Line itself was formed from the following four canals:

- Birmingham & Warwick Junction Canal (Salford to Bordesley)
- Warwick & Birmingham Canal (Bordesely to Warwick)
- Warwick & Napton Canal (Warwick to Napton)
- Grand Junction Canal (Brentford to Braunston)

There is a five mile section from Braunston to Napton which is actually the Oxford canal. This section was never bought by the Grand Union Canal Company.

Locks 1 - 3 Calcutt locks (16' 3")

Lock 1 Calcutt Top lock

Lock 2 Calcutt Middle lock

Lock 3 Calcutt Bottom lock

Locks 4 - 11 Stockton locks (54' 7")

Lock 4 Stockton Top lock

Lock 5

Lock 6

Lock 7

Lock 8

Lock 8

Lock 9

Lock 10

Lock 11 Stockton Bottom lock

Lock 12 - Shop lock (6' 1")

Lock 13 - Itchington Bottom lock (6' 7")

Lock 13 Itchington Bottom lock

Locks 14 - 17 Bascote locks (26' 9")

Locks 14 & 15 Bascote staircase

Lock 16 Bascote Middle lock

Lock 17 Bascote Bottom lock

Lock 17 Bascote Bottom lock

Lock 18 - Welsh Road lock (6' 11")

Lock 19 - Wood lock (6' 7")

Locks 20 - 22 Fosse locks (21' 0")

Lock 20 Fosse Top lock

Lock 21 Fosse Middle lock

Lock 22 Fosse Bottom lock

Lock 22 Fosse Bottom lock

Lock 23 Radford Bottom lock (7' 9")