Mayroyd Mill Wheelhouse, And Attached Weir And Culvert

The building is a wheelhouse, dating from the early 19th century, associated with a now-demolished mill. It is constructed of hammer-dressed stone, and a stone slate roof survives in part; one end of the roof is clad in asbestos over a wooden extension. The east-facing elevation features a central doorway flanked by windows, all with plain stone surrounds. A gable end return wall contains two similar windows overlooking the River Calder. The rear of the building has a large, semi-circular arched entrance leading to a sluice. Inside, a cast iron and steel undershot water wheel is located, measuring 16 feet in diameter and 15 feet wide. The weir, set diagonally across the river, is a low, buttressed structure. Attached to the wheelhouse and where the water is discharged from the wheel is an arched stone culvert, constructed of dressed stone. The culvert has a simple rounded arch profile, measures 5 metres wide and 2 metres high above the present water level, and extends for 440 metres, with a nearly flat gradient dropping only 0.2 metres in total length.