Horn Bridge, Tollymore Park, Newcastle, Co Down

Horn Bridge is a decorative mid-18th century vehicle bridge carrying a drive within Tollymore Park, County Down, over a stream that has since been largely culverted. It is situated to the north of the park, just south of where Tollymore House once stood.

The bridge is mainly harled and features a single, small, pointed arch. Either side of the arch are quatrefoil recesses and end pilaster piers. The outer ends of the bridge face are set back slightly. The castellated parapet oversails the structure and has roughly circular end piers with domed caps, and rectangular recesses to the inner and outer sides. To the east and west ends the parapets are splayed and have granite coping, terminating in square end piers surmounted by rugby ball-sized rounded "bap" stones. The drive over the bridge is surfaced in fine gravel.

The bridge takes its name from the fact that curved whale bones were once set into the parapet, probably within the recesses on the piers. Below the bridge the stream has been culverted — apparently during the 1960s — and it is now possible to walk under the arch on a wooden boardwalk and onto paths leading north and south. These paths are fringed with low rubble walling and are accompanied at various points along the stream by small ornamental bridges with low parapets matching the rubble walling of the path edges. Stone steps give access to the paths.

Like many of the other bridges and structures built within Tollymore Park during this period, Horn Bridge was probably designed under the influence of Thomas Wright of Durham, a part-time architect and friend of both the 1st and 2nd Earls of Clanbrassil, who visited Ireland in 1746–47. The gothick detailing of the bridge is consistent with Wright's known aesthetic approach and with the character of the wider collection of park structures. The bridge is believed to have been built around the same time as the nearby Clanbrassil Barn, which was added in 1757, making it a product of the 1st Earl's development programme, though it may equally date from the period of the 2nd Earl.

Tollymore Park has a long and layered history. In late medieval times the land was under the lordship of the Magennis family of Upper Iveagh. In 1611, Brian MacHugh Magennis received a royal grant of seven and a half townlands from King James I. The estate remained in the Magennis male line until around 1685, when Bernard Magennis died childless and the property passed to his sister Ellen, who had married William Hamilton. Their son James inherited, and his son — also James — was created Viscount Limerick in 1719 and Earl of Clanbrassil (of the second creation) in 1728.

This first Earl, widely remembered by his earlier title of Lord Limerick, began transforming Tollymore into a naturalistic landscape demesne around 1720. He enclosed much of the land to form a deer park, undertook large-scale tree planting, built a hunting lodge and the Old Bridge, and rebuilt the parish church at Bryansford — the small estate village to the north of the park, named after his ancestor Brian Magennis. Around 1750 he began construction of a larger house, likely taking design advice from Thomas Wright. Dr. Pococke, in his Tour of Ireland of 1752, recorded that Lord Limerick had completed two rooms of his new "pretty lodge" by that date and had also built "a thatch'd open place to dine in" on the south side of the Shimna River. Lord Limerick died in 1758 and was succeeded by his son, also named James, who extended the new house and continued the tree planting.

In the 1780s the 2nd Earl erected the Barbican gate at the eastern entrance of the park, the gothick gate at the Bryansford entrance, the hermitage, the gothick follies and steward's lodge on the Hilltown Road, and a number of bridges within the park including Ivy Bridge, Parnell's Bridge, and Foley's Bridge — the last named after his wife, Grace Foley. These additions, together with the planting, made Tollymore one of the most admired estates in Ireland. Bernard Scalé's map of the park from 1777 conveys the picturesque quality of the landscape during this period, showing a rolling terrain with extensive planting, meadows, rivers, streams, and woodland walks. An advertisement in the Belfast News-Letter of 26 April 1785 offering lodgings in Bryansford made much of the "most pleasing prospect of the Right Hon. Earl of Clanbrassil's much admired demesne, which is beautiful to the sight and extensive to the bounds," and praised the wholesome air and herbage on which the goats fed, noting it was "much frequented by ladies and gentlemen for the recovery of lost health."

The 2nd Earl died without issue in 1798 and the park passed to his sister Anne, wife of Robert Jocelyn, 1st Earl of Roden. Their son Robert, 2nd Earl of Roden, inherited in 1802 and built the Bryansford and Barbican gate lodges (the latter now demolished), and erected an obelisk monument to the east of the house in memory of his second son James, who died prematurely in 1812. The 2nd and 3rd Earls further developed Bryansford village. A Roman Catholic church was built at the eastern edge of the village in 1820, school houses in 1823 and 1826, and labourers' dwellings and the large dower house known as The Nest were added around the same time. The 3rd Earl constructed a water-powered sawmill within the demesne and in 1865 added another small lodge to the east. He also enlarged Tollymore House by adding an additional storey to the wings and a tall French chateau-style roof — somewhat incongruous in character — to the original central block.

Tollymore Park remained in the Roden family until 1930, when the 8th Earl sold two-thirds of the land to the Ministry of Agriculture for afforestation. The remaining third was acquired by the Ministry in 1940, and during the Second World War Tollymore House and part of the grounds were used by the Army. After the war the house fell into disrepair and was demolished by Lord Roden in 1952. In 1955 Tollymore became the first state forest to be designated a Forest Park and was opened to the public. It has since been developed for timber production, recreation, conservation, and education. Though the house itself is gone, most of the park's 18th and early 19th century gates, bridges, and lodges have survived, of which Horn Bridge is among the more distinctive examples.