131 miles of navigable water, 169 locks, 25 named marinas and moorings. Passes Birmingham, Leicester, Berkhamsted, Bletchley, Brentford, Fenny Stratford, Hemel Hempstead, Kings Langley, Leighton Buzzard, Linslade, Loughborough, Rickmansworth, Royal Leamington Spa, Southall, Uxbridge, Warwick, Wolverton.
Will your boat fit?
Boat
Size
Fits?
Narrowboat
57ft × 6ft 10in
Fits
Long narrowboat
70ft × 6ft 10in
Fits
Widebeam
60ft × 10ft
Some sections
Widebeam
60ft × 12ft
Some sections
Dutch barge
70ft × 14ft 6in
Too big
Length and beam against Canal & River Trust. “Some sections” means your boat is too big for at least one section or lock. Draught and headroom aren't checked here: see the table below.
Published size limits
Maximum boat sizes in metres, from the Canal & River Trust's waterway dimensions (page last edited 26 Mar 2026). “–” means the Trust doesn't give a figure.
Section
Length
Beam
Draught
Headroom
River Thames into Limehouse Basin only
28
7.5
–
–
River Thames into Brentford Basin only
22.87
5.02
–
–
Brentford to Bulls Bridge
21.95
4.27
1.3
2.67
Bulls Bridge to Berkhamsted
21.95
4.27
1.1
2.67
Berkhamsted to Long Buckby
21.95
3.81
1.17
2.67
Long Buckby to Camp Hill Locks
21.95
3.81
1.17
1.9
Camp Hill Locks to Digbeth and Salford
21.69
2.13
1.17
2.44
Marinas and moorings
Each opens its Check a Mooring page: what's nearby on the water and ashore.