Pont Marius Gontard, Road bridge in Grenoble, France.

Pont Marius-Gontard is a stone and concrete road bridge over the Isère, linking rue Marius-Gontard on the left bank to the Quais de France and Perrière on the right. Its 73-metre deck rests on three spans, the central one 27 metres wide, built in 1839 of Sassenage stone. A rectangular concrete pier rises from the water to the deck, and a vertical line on both parapets marks the start of Grenoble's kilometre numbering.

The original structure dates to the early 1600s but suffered repeated flood damage and required rebuilding over time. The current stone version was completed in the 1800s, replacing earlier wooden or less durable versions.

The bridge has borne the name of Marius Gontard, a Grenoble general councillor (1856-1923), since 1924, taking the name of the street it extends. At its centre, a vertical line on both parapets marks the starting point of the kilometre numbering, with the altitude 216.965 metres engraved on either side of the line.

The bridge links rue Marius-Gontard on the left bank with the junction of the Quais de France and Perrière on the right bank. Look for the vertical line on both parapets at mid-span: it marks the starting point of Grenoble's kilometre numbering, with the altitude 216.965 m engraved beside it.

During the 1980s, the bridge's foundation was reinforced to prevent erosion from below that threatened its stability. This maintenance work proved essential for protecting the structure for decades to come.