1, The flight of fourteen locks ? numbers 8 to 21 - on the Crumlin Branch of the Monmouthshire and Brecon Canal (NPRN 85172) were designed by the engineer Thomas Dadford junior (whose father had worked with the pioneering James Brindley) in 1792 - 99. The locks achieve a rise of 82 metres (268ft) in 800 metres (or half a mile).
The locks have been laid out for public display with an interpretation centre at the top of the flight. The top lock was fully restored in 2002, although the rest of the flight does not have gates. The flight consists of unusually deep masonry chambers that are grouped in pairs with short intervening pounds. One lock has been cleaned down to its masonry invert arch: a common strengthening floor for a lock but one not usually seen. There is a lime kiln (NPRN 85169) half way down the locks.
Sources: Falconer, 1976; SRH field visit 1989.
(Site entry by S.R.Hughes for Buildings of Gwent, John Newman, 2000)
A Guide to the Industrial Archaeology of South East Wales, AIA, 2003
RCAHMW, 24 June 2011.

2. Fourteen Locks, also known as the Cefn Flight, is located on the Crumlin arm of the Monmouthshire Canal at Rogerstone, near Newport. The flight of locks was completed in 1799 and is one of the steepest rises for a major run in the UK. The run of locks includes a series of embanked ponds, pounds, sluices and weirs to control the water supply, with no set of gates shared between individual locks. The image referenced below shows a derelict lock at the limit of the current operational waterway.(image DS2015_136_005).
RCAHMW, 23 November 2015

3. On the Crumlin Arm, built 1792-9, fourteen locks grouped in pairs with side-ponds, achieving a rise of 268ft in half a mile. Designed by T. Dadford junior. Except for the top lock, which was fully restored in 2002, the restored flight is gateless. Interpretation centre at top of flight.
(A Guide to the Industrial Archaeology of South East Wales, AIA, 2003)
B.A.Malaws, RCAHMW, 03 August 2018.