
Black Jack's Lock No 4
Watery Lane, Marsworth HP23 4LY, United Kingdom
Address is taken from a point 269 yards away.
Address is taken from a point 269 yards away.

Black Jack's Lock No 4
is a minor waterways place
on the Grand Union Canal (Grand Junction Canal - Aylesbury Arm) between
Marsworth Junction (Junction of Grand Union Aylesbury Arm with Main Line) (2 furlongs
and 3 locks
to the east) and
Aylesbury Basin Visitor Moorings (5 miles and 6¾ furlongs
and 12 locks
to the west).
The nearest place in the direction of Marsworth Junction is Marsworth Lock No 3;
¾ furlongs
away.
The nearest place in the direction of Aylesbury Basin Visitor Moorings is Marsworth Lock No 5;
1¼ furlongs
away.
Mooring here is unrated.
This is a lock, the rise of which is not known.
Marsworth Junction | 2 furlongs | |
Marsworth Narrow Locks (Staircase Lock Nos 1 and 2) | 1½ furlongs | |
Watery Lane Bridge No 1 | 1¼ furlongs | |
Marsworth Lock No 3 | ¾ furlongs | |
Black Jack's Lock No 4 | ||
Marsworth Lock No 5 | 1¼ furlongs | |
Dixons Gap Lock No 6 | 2½ furlongs | |
Wingrave Road Bridge No 2 | 2½ furlongs | |
Aylesbury Arm Lock No 7 | 3¾ furlongs | |
Jefferies Lock No 8 | 4¾ furlongs |
- Grand Union Canal Walk — associated with Grand Union Canal
- An illustrated walk along the Grand Union Canal from London to Birmingham
- THE GRAND JUNCTION CANAL - a highway laid with water. — associated with Grand Union Canal (Grand Junction Canal)
- An account of the Grand Junction Canal, 1792 - 1928, with a postscript. By Ian Petticrew and Wendy Austin.
Mouseover for more information or show routes to facility
Nearest water point
In the direction of Aylesbury Basin Visitor Moorings
Aylesbury Circus Field Basin — 4 miles, 7¼ furlongs and 11 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
Aylesbury Basin Visitor Moorings — 5 miles, 6¾ furlongs and 13 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
In the direction of Marsworth Junction
Marsworth Services — 2½ furlongs and 4 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Marsworth Services
Winding Hole near Bulbourne Bridge — 1 mile, 4¼ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Winding Hole near Bulbourne Bridge
Cowroast Lock No 46 — 4 miles, 2½ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Lock No 46
Slapton Wharf — 4 miles, 4¾ furlongs and 12 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Slapton Wharf
Leighton Linslade Services — 8 miles, 2¾ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Leighton Linslade Services
Rothschild Road Wharf — 8 miles, 7¼ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Rothschild Road Wharf
Berkhamsted Services — 6 miles, 7½ furlongs and 18 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Berkhamsted Services
Bank Mill Service Station — 7 miles, 5¾ furlongs and 21 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bank Mill Service Station
Soulbury Bottom Lock No 24 — 12 miles, 3 furlongs and 18 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Soulbury Bottom Lock No 24
Willowbridge Marina — 14 miles, 5¼ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Willowbridge Marina
Middlesex & Herts Boat Services Wharf — 9 miles, 5½ furlongs and 26 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Middlesex & Herts Boat Services Wharf
Fenny Stratford Services — 16 miles, 3¾ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Fenny Stratford Services
Peartree Bridge No 88 — 18 miles, 5¼ furlongs and 21 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Peartree Bridge No 88
Apsley Services — 12 miles, ½ furlongs and 31 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley Services
Nash Mill Top Lock No 68 — 12 miles, 5¾ furlongs and 33 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Nash Mill Top Lock No 68
Cassiobridge Water Point — 18 miles, 1¾ furlongs and 44 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cassiobridge Water Point
Bridgewater Basin — 18 miles, 2¾ furlongs and 45 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bridgewater BasinNearest rubbish disposal
In the direction of Aylesbury Basin Visitor Moorings
Aylesbury Basin Visitor Moorings — 5 miles, 6¾ furlongs and 13 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
In the direction of Marsworth Junction
Marsworth Services — 2½ furlongs and 4 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Marsworth Services
Town Field Farm Bridge No 130 — 4¼ furlongs and 4 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Town Field Farm Bridge No 130
Cowroast Marina — 4 miles, 1¾ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Marina
Cowroast Lock No 46 — 4 miles, 2½ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Lock No 46
Leighton Rubbish Disposal — 8 miles, 2¼ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Leighton Rubbish Disposal
Berkhamsted Services — 6 miles, 7½ furlongs and 18 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Berkhamsted Services
Soulbury Middle Lock No 25 — 12 miles, 2½ furlongs and 17 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Soulbury Middle Lock No 25
Fenny Stratford Services — 16 miles, 3¾ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Fenny Stratford Services
Fisheries Lock No 63 — 10 miles, 5¾ furlongs and 28 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Fisheries Lock No 63
Apsley Services — 12 miles, ½ furlongs and 31 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley Services
Apsley Marina — 12 miles, 2¾ furlongs and 33 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley MarinaNearest chemical toilet disposal
In the direction of Aylesbury Basin Visitor Moorings
Aylesbury Basin Visitor Moorings — 5 miles, 6¾ furlongs and 13 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
In the direction of Marsworth Junction
Marsworth Services — 2½ furlongs and 4 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Marsworth Services
Cowroast Marina — 4 miles, 1¾ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Marina
Cowroast Lock No 46 — 4 miles, 2½ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Lock No 46
Leighton Linslade Services — 8 miles, 2¾ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Leighton Linslade Services
Fenny Stratford Services — 16 miles, 3¾ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Fenny Stratford Services
Apsley Services — 12 miles, ½ furlongs and 31 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley Services
Apsley Marina — 12 miles, 2¾ furlongs and 33 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley MarinaNearest place to turn
In the direction of Aylesbury Basin Visitor Moorings
College Road Winding Hole — 2 miles, 6¼ furlongs and 10 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
Aylesbury Basin — 5 miles, 6½ furlongs and 13 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
Aylesbury Basin Visitor Moorings — 5 miles, 6¾ furlongs and 13 locks away
On this waterway in the direction of Aylesbury Basin Visitor Moorings
In the direction of Marsworth Junction
Marsworth Junction — 2 furlongs and 4 locks away
On this waterway in the direction of Marsworth Junction
Bulbourne Junction — 1 mile, 1¼ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bulbourne Junction
Winding Hole near Bulbourne Bridge — 1 mile, 4¼ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Winding Hole near Bulbourne Bridge
Gammel Bridge Winding Hole — 1 mile, 7¾ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bulbourne Junction, then on the Grand Union Canal (Grand Junction Canal - Wendover Arm - restored section) to Gammel Bridge Winding Hole
Little Tring Winding Hole — 2 miles, 4¼ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bulbourne Junction, then on the Grand Union Canal (Grand Junction Canal - Wendover Arm - restored section) to Little Tring Winding Hole
Station Road Bridge Winding Hole — 2 miles, 7¾ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Station Road Bridge Winding Hole
Saxon Way Winding Hole — 4 miles, 2 furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bulbourne Junction, then on the Grand Union Canal (Grand Junction Canal - Wendover Arm - restored section) to Little Tring Winding Hole, then on the Grand Union Canal (Grand Junction Canal - Wendover Arm - unrestored section) to Saxon Way Winding Hole
Cowroast Winding Hole — 4 miles, 2 furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Winding Hole
Slapton Winding Hole — 4 miles, 4½ furlongs and 12 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Slapton Winding Hole
Grove Lock Marina — 6 miles, 7¼ furlongs and 14 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Grove Lock Marina
Grove Lock Arm — 7 miles and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Grove Lock Arm
Leighton Buzzard Bridge Winding Hole — 8 miles, 2½ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Leighton Buzzard Bridge Winding Hole
Bossington Lane Winding Hole — 8 miles, 6½ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bossington Lane Winding Hole
Rothschild Road Wharf — 8 miles, 7¼ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Rothschild Road Wharf
Old Linslade Winding Hole — 10 miles, 5½ furlongs and 16 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Old Linslade Winding Hole
Bullbeggers Lane Winding Hole — 8 miles, 1½ furlongs and 22 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bullbeggers Lane Winding Hole
Winding Hole below Stoke Hammond Lock — 13 miles, 5¾ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Winding Hole below Stoke Hammond LockNearest self-operated pump-out
In the direction of Marsworth Junction
Marsworth Services — 2½ furlongs and 4 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Marsworth Services
Cowroast Marina — 4 miles, 1¾ furlongs and 11 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cowroast Marina
Willowbridge Marina — 14 miles, 5¼ furlongs and 20 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Willowbridge Marina
Middlesex & Herts Boat Services Wharf — 9 miles, 5½ furlongs and 26 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Middlesex & Herts Boat Services Wharf
Apsley Marina — 12 miles, 2¾ furlongs and 33 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Apsley MarinaNearest boatyard pump-out
In the direction of Marsworth Junction
Cheddington Wharf — 1 mile, 5¾ furlongs and 6 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Cheddington Wharf
Grove Lock Marina — 6 miles, 7¼ furlongs and 14 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Grove Lock Marina
Rothschild Road Wharf — 8 miles, 7¼ furlongs and 15 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Rothschild Road Wharf
Middlesex & Herts Boat Services Wharf — 9 miles, 5½ furlongs and 26 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Middlesex & Herts Boat Services Wharf
Milton Keynes Marina — 18 miles, 4½ furlongs and 21 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Milton Keynes Marina
Campbell Wharf Marina — 19 miles, 6¾ furlongs and 21 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Campbell Wharf Marina
Bridgewater Basin — 18 miles, 2¾ furlongs and 45 locks away
Travel to Marsworth Junction, then on the Grand Union Canal (Grand Junction Canal - Main Line - Gayton to Brentford) to Bridgewater BasinDirection of TV transmitter (From Wolfbane Cybernetic)
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