Melin Uchaf Bryn Du · Isle of Anglesey · Wales

Melin Uchaf stands within a farm complex at Bryn Du, south of the road through the village and within the community of Llanfaelog. It is also known as Melin Maelgwyn, and as the upper mill of Llanfaelog, standing on higher ground than Melin y Bont, the lower mill.

The tower was built in 1789. A stone tablet above the doorway bears the date and the initials OK R. The mill belongs to the main period of Anglesey windmill construction, when the island's exposed landscape and grain production supported many wind-powered corn mills. By the early to mid nineteenth century more than 40 windmills were operating on Anglesey.

The surviving tower is full height and four storeys high. It is circular in plan, with slightly tapering rubble-masonry walls, partly rendered, and a corrugated-iron cap. Doorways survive at ground and first-floor levels, and rectangular windows are present at each storey. The tower is notable as a substantially intact full-height survival. It is one of the surviving towers from Anglesey's former windmill landscape, in which many earlier examples have been truncated, demolished, or converted.

Melin Uchaf was listed at Grade II on 5 April 1971. Its special interest lies in its survival as one of only eighteen full windmill towers remaining on Anglesey at the time of the listing description, and as one of the earliest windmills on the island still surviving as a complete tower. Local history also records the name Melin Maelgwyn and identifies the tower with the upper of the two Llanfaelog windmills.