The difference in water levels at Fenny Stratford is only about 12 inches. This makes it the lock with the smallest drop on the canal system. There is also a swing bridge on the canal at Fenny Stratford by the former lock keepers cottage.
The above extract is from the 1881 census for Buckinghamshire and shows 6 narrow boats moored between Fenny Lock and Simpson Wharf . (To view the actual content, please click on extract)