Ventilation Shafts, Midgley Moor

To the west of the Castle Carr estate, these two shafts marked on the Ordnance Survey map allowed ventilation / access to a pipe that took water from the Walshaw Dean reservoirs to Halifax. I found interesting the mounds surrounding each shaft, clearly the spoil from their construction. Using the volume of the spoil mound it would be possible to calculate the depth of the shafts.

Done