Bridge of Grand-Arvou, Medieval stone arch bridge in Porossan, Italy.
The Bridge of Grand-Arvou is a stone arch structure spanning approximately 68.5 meters across the Rû Prévôt irrigation canal. The passage above is covered with protective flagstones that shield the water flowing beneath.
Henry of Quart, provost of Aosta Cathedral, commissioned this structure in the late 13th century to enhance water distribution for farming in the region. The investment demonstrated how irrigation had become critical for agricultural survival in the valley.
The structure served as a key part of the irrigation system that sustained agriculture in the valley for centuries. It reflects how communities organized themselves around water management and shared resources.
The bridge is best reached by parking near Corsica and following a short walking path that leads directly to the structure. The walk is straightforward but requires sturdy footwear due to uneven ground and natural terrain.
The structure cleverly serves two purposes at once, with a path running on top while water flows through the barrel vault below. This dual-function design was an ingenious medieval solution for handling both foot traffic and irrigation water.
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