Planning On 30 November 1861, the French (the Lighthouse Commission) decided in favour of constructing a "3rd order" lighthouse on Gorlebella rock, inviting engineers to carry out a pilot study the following year. The study was postponed, however, due to funding difficulties as well as other construction projects such as
Ar Men having just begun. The project resumed ten years later, but the (Lighthouse Service) director was forced to admit on 1 June 1872 that "construction of a lighthouse on La Vieille will be postponed for the foreseeable future, and the difficulties encountered in embarking on the rock could even see it abandoned altogether". A meeting convened on 14 January 1873 agreed that "the exceptional difficulties that this public work presents compels us to postpone the project, particularly given the presence of similar work being undertaken on the rock of Ar Men". In the meantime the lanterns of nearby
Phare de Tévennec and the
Île-de-Sein light partially compensated for the continuing lack of a lighthouse. Construction was preceded by a series of feasibility studies. In 1879, the first of five landings at the rock was carried out, during which
currents and ease of docking at the site were assessed. Fishermen from the
Île de Sein, begrudgingly or otherwise, successfully established the first mooring points. Six cubic metres of stonework were built for the base, with the help of stonemasons who had already worked on the lighthouse of Ar Men. This enabled the rock to be boarded from the north-east. The following year, a dozen more landings were carried out. Mooring rings and securing bars were implanted, which acted as a solid base that could subsequently be used as a landing platform for building materials. This foundation was built out of 37 cubic metres of stone work. The Minister of Public Works,
Sadi Carnot, issued a statement on 29 January 1881 that "from information gathered and results obtained during the 1879–80 initiatives, it is clear we can establish a lighthouse on the rock of Vieille, with the amount to be spent in alignment with the services required." A credit of 100,000
francs was approved in April 1882. Although the project had been given the go ahead, the conditions promised a difficult road ahead. In this area of the sea, strong currents surround the rock of Gorlebella almost permanently, due to its location in the direction of the currents. Its few sheltered areas are accessible only for short periods. Shallow waters lay to the south. Toward the east and west currents ranging from 6–15
knots prevent mooring. Consequently, La Vieille could only be approached from the north side, and even then only during the three days either side of the quarter moon, if the sea is perfectly calm. In rough seas, whirlpools of 40 to 50 metres can be present. Despite these obstacles, construction turned out less dangerous than at Ar Men. This is due to the fact the rock juts 14 metres above high tide. This shape made it possible to erect a solid 20 metre by 10 metre platform. Fenoux, the engineer holding responsibility for the lighthouse construction, estimated work could take place for five months per year, made up of two days of good weather each quarter moon, amounting to about 30 landings yearly.
Construction Firm commitment by the Minister of Public Works to construction of the lighthouse finally came on 29 January 1881, after two years of assessment. Work commenced at Île de Sein, where the raw materials (
stone) were stored. The engineer in charge of overseeing the works, Probestau, set up home on the island. Since the construction of La Vieille followed Ar Men, the team were able to draw on a wealth of experience. Each year on the first of May, workmen would arrive at the island in a small steam-powered boat towing a
longboat laden with construction materials, as well as rowboats for landing. Anchorages set up allowed the team to
moor the steamboat and longboat. from
Cap Sizun Three
deadweights in the south-west of the rock were laid down, to dock the boat nearby during
flot and ebb tides. A
mooring buoy floated a short distance from the steamboat. The steamer anchored at nearby
Cap Sizun stood ready to intervene at the slightest signal if the spring tides rose too high. In the first landings the team erected a small stone shelter, in a hollow to the east of the rock. This housed the workers, their food, and their tools, allowing the team to work on the rock uninterrupted, whenever weather allowed. On 5 August 1882, work began on the masonry structure. The tower, its base, and part of the interior were finished in 1886, after three seasons of work. The stonework was
reinforced with
Portland cement from
Boulogne mixed with seawater for the base, but with freshwater for the rest of the building. The remaining interior work was finished in 1887. The feasibility studies and construction were directed from 1879 to 1885 by the engineer in chief of the , named Fenoux. He was replaced from 1886–1887 by Considere. They were assisted by an engineer named Miniac, who was resident at the site throughout its development. The date of completion (1887) is inscribed on the tower. The lamp at La Vieille was first lit on 15 September 1887. ==Architecture and fittings==