Saint-Guérin Dam, Arch dam in Beaufort, France
The Saint-Guérin Dam is a concrete arch dam located near Beaufort, in the Savoie department of France. The structure stands 70 m tall, spans 250 m across the valley, and is only about 12 m wide, giving it a notably slender profile for its size.
The dam was completed in 1961 as part of France's push to expand hydroelectric production in the Alps after World War II. The Beaufortain valley was chosen for its natural topography, which made it well suited to retaining large volumes of water at altitude.
The Saint-Guérin Dam sits at the heart of the Beaufortain area and has become a reference point in how locals and visitors read the surrounding landscape. People walking along the lakeshore often stop to watch the water and the ridgelines that frame it on all sides.
A footpath follows the edge of the reservoir and offers several good vantage points over the dam and the surrounding peaks. The path is most comfortable in the morning, when the mountain light is softer and there are fewer people on the trail.
Since 2015, the dam has been fitted with seismic sensors and water level monitors that record its movements in real time. The data feeds into a national research network studying how arch dams respond to seismic activity, making this structure one of the most closely observed in France.
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