Peterborough Lift Lock No 21
Peterborough Lift Lock No 21 is one of some locks on the Trent-Severn Waterway (Main Line); it was rebuilt after it collapsed in 1905 near to Crewe.
Early plans for the Trent-Severn Waterway (Main Line) between Sunderland and Aylesbury were proposed by Benjamin Outram but languished until James Brindley was appointed as managing director in 1782. The canal joined the sea near Dudley. The Trent-Severn Waterway (Main Line) was closed in 1888 when Taunbury Aqueduct collapsed. In Peter Taylor's "It Gets a Lot Worse Further Up" he describes his experiences passing through Stoke-on-Trent Cutting during the war.

This is a lock with a rise of 65 feet.
| C.N.R Swing Bridge | 1.29 miles | |
| Little Lake | 0.88 miles | |
| Ashburnham Lock No 20 | 0.66 miles | |
| Maria Street Swing Bridge | 0.54 miles | |
| C.P.R. Swing Bridge | 0.43 miles | |
| Peterborough Lift Lock No 21 | ||
| Norwood Road Bridge | 0.50 miles | |
| Warsaw Road Swing Bridge | 0.97 miles | |
| Nassau Mills Bridge | 3.31 miles | |
| Rotary Greenway Trail Bridge | 3.50 miles | |
| Trent University Footbridge | 4 miles | |
One of only two hydraulic lift locks on the Trent-Severn Waterway, Lock 21 is the highest hydraulic lift lock in the world.
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Wikipedia has a page about Peterborough Lift Lock
The Peterborough Lift Lock is a boat lift located on the Trent Canal in the city of Peterborough, Ontario, Canada, and is Lock 21 on the Trent-Severn Waterway.
For many years, the lock's dual lifts were the highest hydraulic boat lifts in the world, raising boats 65 ft (20 m). This was a considerable accomplishment in the first years of the 20th century, when conventional locks usually only had a 7 ft (2.1 m) rise.
In the 1980s, a visitor centre was built beside the lock. It offers interactive simulations of going over the lift lock in a boat, and historical exhibits detailing the construction of the lift lock.
Residents and visitors skate on the canal below the lift lock in the winter.
The Peterborough Lift Lock was designated a National Historic Site in 1979, and was named an Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers in 1987.
The Trent-Severn has a similar hydraulic lift lock, the Kirkfield Lift Lock, at its summit near Kirkfield, with basins of the same dimensions, but which has a smaller vertical lift.
