T he balsa is fed by a canal running about two meter above the riverbed and coming from about 100 meter upstream. This is only one of the reservoirs. The mill of Lecina has in fact also an upper balsa behind the solid and curved azud . Compare with the dam of the mill in Samper . A row of old wooden stakes across the river shows the location of an earlier and simpler azud .
Picture below shows a hole in the rock waiting in vain for a pole.