Pont à la Polonceau (Bourguignon-lès-Conflans)

Pont à la Polonceau, near Bourguignon-lès-Conflans, is a metal bridge spanning the Lanterne river right on the boundary between two communes in the Haute-Saône department: Bourguignon-lès-Conflans and Mersuay. The name references the former village, but the structure itself also sits on the territory of neighboring Mersuay — the bridge crosses the riverbanks exactly where the two administrative areas meet. For visitors, this means the bridge is sometimes attributed to one commune and sometimes to the other, depending on the source, even though it is physically a single crossing.

Where exactly is the bridge located?

The bridge sits at roughly 47.80° N, 6.16° E, placing it in the heart of Haute-Saône, a department within the Bourgogne-Franche-Comté region in eastern France. The Lanterne river, which the bridge crosses, is a right-bank tributary of the Saône and winds through small villages in this area, forming quiet, picturesque valleys that see little tourist traffic. Travelers should expect to find the bridge among fields, meadows, and small clusters of houses rather than any urban infrastructure or crowds of visitors.

What is a "Polonceau" bridge?

The name "Pont à la Polonceau" is not incidental — it refers to a specific type of engineering structure developed by French engineer Camille Polonceau in the late 1830s. The Polonceau truss combined cast-iron or wrought-iron compression members with metal tie rods working in tension, allowing engineers to build lighter and cheaper spans than earlier stone or timber solutions. The design spread quickly across France alongside the expansion of the railway and road networks during the industrial era, becoming one of the hallmarks of 19th-century metal engineering. The bridge over the Lanterne is an example of exactly this kind of structure — a metal crossing typical of the period, built with durability and material economy in mind.

What should visitors know before going?

This is a modest, low-key site rather than a mainstream tourist attraction — it's an element of the local engineering landscape that will appeal mainly to enthusiasts of industrial architecture, the history of technology, and travelers exploring the lesser-known corners of Franche-Comté. The area around Bourguignon-lès-Conflans and Mersuay is typical of the region's rural character: small villages, farmland, and a river valley set well away from the main tourist routes. Visitors interested in the bridge might combine the stop with a look at other villages along the Lanterne valley, since the area offers a quiet, authentic slice of French provincial life rarely touched by mass tourism.

Travelers with an interest in engineering history will appreciate the bridge as a testament to an era when iron and steel bridges increasingly replaced traditional stone construction, particularly in smaller localities where cost and speed of construction mattered greatly.

Frequently Asked Questions

Is Pont à la Polonceau located in Bourguignon-lès-Conflans or in Mersuay? The bridge sits right on the boundary between the two communes. Its name references Bourguignon-lès-Conflans, but the structure also extends onto the territory of Mersuay, since it crosses the Lanterne river exactly where the two communes meet.

What does "Polonceau" refer to in the bridge's name? It refers to a type of bridge truss developed by French engineer Camille Polonceau in the 19th century, combining compression members with metal tie rods — a design widely used in French bridge-building during the industrial era.

Which river does the bridge cross? The bridge crosses the Lanterne river, a right-bank tributary of the Saône, which flows through the Haute-Saône department in the Bourgogne-Franche-Comté region.

Is this a popular tourist attraction? No — it's a small, local engineering landmark of interest mainly to those curious about the history of technology, and to travelers exploring the quieter, rural parts of France.