Polonceau Bridge at Bourguignon-les-Conflans
Pont à la Polonceau (Lanterne), over the River Lanterne à Bourguignon-lès-Conflans, connects Bourguignon-lès-Conflans and Mersuay in the Haute-Saône department in France.
It was built in 1849 by Jérôme Patret based on plans by the engineer Nicolas Cadiat. The iron parts come from the Fonderie de Varigney.
It is one of the oldest surviving cast iron bridges in France. Like the Pont Saint-Thomas (Strasbourg), it was built according to the system of Antoine Rémy Polonceau, and is similar to the old Carrousel bridge in Paris designed by this engineer.
The bridge has two arches with spans of 24.30 m each.
See Wikipedia entry and Structurae entry.