Locks: Grand Union Canal South 53 - 76

 Grand Union Main Line Southern section, locks 53 - 76:  Berkhamstead to Cassiobury

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 southern section runs from Brentford in London 93 ½ miles through 101 locks to Braunston. The southern section of the Main Line was originally built as the Grand Junction canal. The Grand Junction canal opened from Braunston to Weedon on 21st June 1796, and a few weeks later it was extended as far south as Blisworth, where a long tunnel was under construction. Blisworth Tunnel and an embankment at Wolverton were not finished until March and August 1805 when the Grand Junction was opened as a through route for the first time. In the meantime goods had to bypass Blisworth Tunnel on a temporary railway, and at Wolverton a diversion via the river Ouse was required.

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.

The Southern Main Line locks are numbered from 1 at Braunston at the northern end to 101 at Brentford at the southern end.

Locks 53 - 55 - Berkhamsted locks (16' 10")

Lock 53 - Berkhamsted Top lock

Lock 54 - Berkhamsted Middle lock

Lock 55 - Rising Sun lock

Lock 55 - Rising Sun lock

Locks 56 - 59 - Bourne End locks (29' 4")

Lock 56 - Top Side lock

Lock 57 - Bottom Side lock

Lock 58 - Sewer lock

Lock 59 - Bourne End bottom lock (6' 10")

Locks 60 & 61 - Winkwell locks (13' 7")

Lock 60 - Winkwell Top lock 

Lock 61 - Winkwell Bottom lock 

Lock 62 - Boxmoor Top lock (6' 8")

Lock 63 - Fishery lock (7' 1")

Lock 64 - Boxmoor lock (7' 1")

Locks 65 - 67 - Apsley locks (16' 0")

Lock 65 - Apsley Top lock

Lock 66 - Apsley Middle lock

Lock 67 - Apsley Bottom lock

Locks 68 & 69 - Nash Mills locks (12' 2")

Lock 68 - Nash Mills lock

Lock 69 - Red Lion lock

Lock 69A - Kings Langley lock (8' 9")




Lock 70 - Home Park lock (5' 2")

Lock 71 - North Grove lock (6' 11")

Locks 72 & 73 - Hunton Bridge locks (11' 2")

Lock 72 - Hunton Bridge Top lock

Lock 73 - Hunton Bridge Bottom lock

Lock 74 - Lady Capel's lock (5' 4")

Locks 75 & 76 - Cassiobury Park locks (11' 0")

Lock 75 - Cassiobury Park Top lock

Lock 76 - Cassiobury Park Bottom lock