Geograph - photograph every grid square

Marsh Lock, number 73

This is an unusual but logical arrangement where the swingbridge goes over the lock, thus saving the boatmen from stopping twice. Just remember to open the swingbridge before you fill the lock. It is necessary because a number of footpaths converge here, from various parts of the surrounding common land, Freeman's Marsh.
The 1:50K map struggles to show the location clearly, presumably because they need to keep the lock and bridge symbols separate. The 1:25K is better.