Ponte Metálica Rio Negro-Mafra, Road bridge over the Negro River in Mafra, Brazil

The Ponte Metálica Dr. Dinis Assis Henning, known as the Ponte Metálica, is an iron bridge over the Negro River linking Mafra, Santa Catarina, to Rio Negro, Paraná. Its metal span measures 71.46 m long, 7 m wide and 8.10 m high, with masonry access viaducts on both banks bringing the total length to 110 m. The metal span is shorter than the masonry embankments it joins.

Built at the Compagnie Dyle et Baccalan shipyards in Leuven, Belgium, the bridge was assembled on site over one year and inaugurated on 22 November 1896, during the term of Paraná governor José Pereira dos Santos Andrade, at a cost of 728 contos and 728 thousand réis. Until then the Negro River was crossed by boat. It was closed to traffic at the end of the 20th century for restoration and reopened in 2000.

The bridge is nicknamed "Ponte Metálica" and is the largest monument in the region, listed by the Conselho Estadual de Cultura of Santa Catarina on 28 September 1999. It stands on a historic-geographic boundary disputed between Santa Catarina and Paraná, and both state governments recognised its value through the heritage listing.

The structure across the river is relatively low and narrow, so drivers should proceed carefully when crossing and watch for oncoming traffic. Visitors can best observe the stone masonry supports from the riverbanks, where the overall construction becomes clearer to understand.

The bridge's official length of 71.46 metres is shorter than the masonry embankments on the Negro River's banks, and no one knows why. One explanation holds that engineers measured the river's dry-season width; a popular tale says two bridges were built in Belgium, and the shorter one meant for an African river of the same name was shipped to Brazil instead.