Carrickhugh Corn Mill, (Walworth Mills), Tullymain, Ballykelly, Limavady, Co Londonderry

A former corn mill building converted to farm use, located at Tullymain near Ballykelly in County Londonderry. The structure comprises a U-shaped group of three-storey stone buildings adjoining the unnamed road between Clooney Road and Carrickhugh Station. It is of significant historical and archaeological interest as part of a mill complex that uniquely benefited from the opening of the railway in 1852, unlike most other mills in the Limavady area. The building is neat and unobtrusive in the landscape but is falling into dereliction.

The west wing is five bays long with openings in stone trimmed in red brick. At second floor level there are six equally distributed openings, the third from the north end being a tall dormer with a hole for a winch above it; the others abut the eaves. The first floor openings are blocked up (there were originally four at the southern end), as is the ground floor door beneath the dormer. The roof is laid in natural slate. A small hip to the south on the gable end contains two high level windows and a blocked-up loading bay opening to first floor level. The north end of the roof has a full hip where the roof changes direction to run over the main range.

The main range runs east for approximately eight structural bays, with four windows centrally placed at third floor level. To the west a tall opening two storeys high provides access to the west wing; the wall above has been rebuilt in blockwork. Adjacent to the east, an arched opening has been reduced in height and fitted with two metal doors. Beyond an oil tank at the eastern end is a ground floor door. First floor openings align with those above. An eastern wing returns to the north from this end. This wing is becoming derelict and, though the same length as the west wing, is twice its width. The two bays nearest the south corner remain reasonably intact, both with ground floor doors. To the north are two further doors; here floors and roofs are largely gone except for one or two queen post trusses remaining. The north gable shows no sign of the chimney marked on current Ordnance Survey maps.

The courtyard created by the building has been enclosed by a corrugated metal shed with a lean-to roof against the main range, accessed via the reduced-height opening in the main range already described. It is concreted and contains farm machinery. Ground floor doors to the east wing open onto it; this wing has a blank wall above. A corrugated metal wall currently occupies the position of the former chimney. The rear of the main range has two circular brick-trimmed louvred openings at first floor level. The openings to the west wing have been blocked up.

The mill is indicated on the 1830 Ordnance Survey map. Remarks in the Ordnance Survey Memoirs of 1835 suggest it was the older of two main mills in the complex, describing it as a corn mill worked by an overshot wheel 13 feet in diameter and 2.5 feet broad, single-geared and of very old-fashioned construction, with a charge for grinding of one thirty-second of the grain ground. The present owner has stated that the wheel was housed inside the building and that there was also a corn kiln with vaulted brick walls five wide at the base. In 1884 the mill was badly damaged by fire and was described at the time as an oat meal and Indian corn mill.

Jacob Levingston owned the mills in the 1830s. George Cather acquired the mills and surrounding farm in the 1840s on land leased from the Fishmongers' Company. He probably improved and expanded the mill and was responsible for a branch line to the building from the nearby railway, which opened in 1852. The Griffiths Valuation of 1858 records Cather as occupier, valuing the corn-mill, kiln, millers house and offices at £33. The Cather family operated the mills and farm until the turn of the century, when the buildings were leased to various operators. They were purchased by the present owner's family in 1948. The Fishmongers Company sold off much of their holdings in the area during the 1890s and likely sold to the Cathers at that time. The mills were in operation until after the Second World War and are labelled as Walworth Mills on the 1923 Ordnance Survey map.

Across the road to the west stands a group of former workers' cottages and a stable yard.