Located near the gravel pit with birds in the town of Mably, the Cornillon lock is close to the mill and the castle of Cornillon. The castle, inhabited all year round, is even visible from the Véloire.
How does a lock work? The boat enters the lock. The lower doors and valves close. Then, the upper valves open, allowing water to enter the lock and raise the boat. When the water level matches that of the upstream part of the canal, the upper doors open and the boat continues on its way. The same procedure is to be followed in reverse for boats going downstream.
