An imposing 320 meter-long and 50 meter-high stone structure that was part of the railway line between Balbigny and Régny, in operation between the world wars. Overlooking the A89 motorway towards Clermont-Ferrand, the bridge is unmissable by motorists. The Espace Trail circuits take in the bridge before descending and passing under its imposing arches to admire it from every angle. . 

Routes to discover the Pont Marteau
Route n°15 : À la conquête du Pont Marteau
Route n°17 : Sous les arches du Pont Marteau