Carrickhugh Flour Mill, Carrickhugh, Ballykelly, Limavady, Co Londonderry

Carrickhugh Flour Mill is a three-storey stone mill complex with natural slate roofs, situated in a valley below Clooney Road just before it enters Walworth Forest, near Ballykelly in County Londonderry. The building forms part of an industrial group of mills connected with the nearby Carrichue House. It is notable as one of the few mills in the area whose main period of production occurred after the arrival of the railway, rather than before.

The complex comprises four main components. The primary structure is a four-bay stone building aligned east-west, running approximately parallel to Clooney Road some fifty metres to its south. Attached to the west end is a three-bay-wide structure of similar height, projecting two metres to the south, with walls to the north aligning with the first building. To the north adjoins a two-storey building one bay wide, whose east facade aligns with the second structure. North of this stands a boiler house with an attached brick chimney. The boiler house's east facade projects a metre and a half beyond the other structures, and its projecting chimney aligns with the west facade of the third building. A large modern opening two storeys high has been cut into the west gable of the first structure, fitted with timber-sheeted doors leading to a barn behind. The approach road passes this entrance and continues to the north side of the building, passing a loading bay situated in the angle formed between the first and third buildings. At third-floor level, the remains of a walkway crosses the corner between the first and third buildings. A sliding door at ground level provides access from the loading bay to the third building. The stone of the main building abuts the tapering brick chimney as it rises.

The mill wheel for the complex was located on the east gable of the second structure, and a deep pit remains for a wheel of 4.5 metres diameter. A raised mill race carried water from ponds, passed under the road, and delivered water to the wheel by wooden flume. Two mill ponds originally fed the complex from the southern side of Clooney Road; one has now been filled in. The roofing consists of a single pitched roof covering the first two structures aligned east-west, a second pitched roof in poor condition covering the third structure, and a lean-to pitched roof over the boiler house, which stands storey and a half high. A date stone near a brick arch on the west gable of the boiler house reads 1861.

The mill is described in the 1830–35 Ordnance Survey Memoirs of Faughanvale Parish as "an excellent flour mill on the side of mail coach road between Londonderry and Newtownlimavady… the property of Mr Jacob Levingston. It is double geared and worked by a breast wheel 18 feet in diameter and four feet broad. As the supply of water is not good in dry weather, the deficiency has been remedied by a steam engine of 12 horse-power which commenced working a few days since." The chimney construction visible on this and other mills in the area, designed to take a supplementary steam engine, demonstrates the need for increased production. The mill became the property of George Cather in the 1840s on land still leased from the Fishmongers Company. Cather appears to have improved the mill, as evidenced by the 1861 date stone on the boiler house. In later years, a gas engine powered by anthracite was used to drive the mill. The Cather family rented out the farm and buildings after the turn of the twentieth century, though the mill continued in operation for various uses until after the Second World War, when it was used for corn grinding. The property was purchased by the present owner's family in 1948, along with the rest of the farm. The mill equipment, which was the property of the last lessor, was subsequently removed for scrap. In addition to a branch line from Carrickhugh Station to the Corn Mill lower down the hill, a narrow-gauge railway once connected the flour mill and the corn mill, now removed.

The building has been gutted inside and converted by the present owner to farm use. It is of industrial archaeological interest but was not considered of sufficient importance to warrant listing.