Borrastre has in common with all the mills receiving their energy from the Río Ara (e.g. Janovas, Lacort) that there is no mill pond. The Río Ara is never dry and carries always enough water in order to make the mill run without the need to stockpile the water first. It was said that the mill could muele de fila.
The mill building is one huge heap of rubble overgrown with Ivy. We couldn't find anything that reminds us of the activities in the past, except for the crane (grua, 1).