Fort du Télégraphe, Military fort in Valloire, France

Fort du Télégraphe stands at 1,585 m above the Arc valley between Valloire and Saint-Michel-de-Maurienne. The Séré de Rivières second-generation fort has an irregular hexagonal plan, compressed because the supporting rock is small. Two entrances, high and low, face the gorge front; the high one is topped by a casemate with firing loopholes. The barracks has four bays on two levels, the powder magazine sits behind it to the left, and four open platforms separated by traverses occupy the top.

A Chappe optical telegraph station on the Lyon–Milan line, later Lyon–Venice, stood here before the fort. The fort itself was built between 1886 and 1890 as part of the Séré de Rivières system. In 1940 it fired 155 mm guns at Italian forces as part of the Deuxième Position, and in 1944 the FFI used it as an artillery position.

The fort's name comes from the Chappe optical telegraph that stood here on the Lyon–Milan line, later extended to Venice in 1809. In 1887 Minister of War Georges Boulanger renamed it Fort Berwick after Marshal Berwick, killed at the siege of Philippsbourg in 1734; the decree was revoked that same October. Since 2017 it has hosted summer visits, photo exhibitions and short lectures, and the film La Montagne aux Mille regards was shot there.

Access to the fort is available during summer months through guided tours that depart from the nearby Col du Télégraphe parking area. Visitors should be prepared for mountain terrain and cooler temperatures at this elevation.

The fort's name comes from the Chappe optical telegraph station that stood here, on the Lyon–Milan line, extended to Venice in 1809. The site was later occupied by Marshal Berwick in the early 18th century, and in 1887 Boulanger briefly gave the fort Berwick's name before the decree was revoked that October.