The lake's dam is a gravity dam made of concrete, standing 120 meters high.
The original hospice at the site was once visited by historical figures including Charlemagne and Napoleon Bonaparte.
The reservoir has a total capacity of approximately 315 million cubic meters of water.
The area is part of a designated high-altitude mountain pasture zone protected for biodiversity.
The border between France and Italy was adjusted following the 1947 Treaty of Paris, placing the lake entirely within French territory.
The water level fluctuates significantly depending on the season, as the reservoir is drained for hydroelectric power generation.
Mont Cenis Lake is a large artificial reservoir situated at an altitude of 1,974 meters in the French Alps near the Italian border. The lake was created by a gravity dam, completed in 1968, which serves as a major hydroelectric facility for the region. The distinctive turquoise color of the water is caused by glacial silt particles suspended in the meltwater. Before the dam's construction, the area was home to the historical Hospice of Mont Cenis, now largely submerged. The surrounding plateaus are known for their high-alpine flora and fauna, including marmots and various wildflower species. The lake sits on a historic mountain pass that has been used since the Roman era for trade and military transit. In summer, the area serves as a hub for hiking, cycling, and mountain exploration. The site is located within the Mont Cenis massif, separating the Maurienne Valley from the Susa Valley. The climate is sub-alpine, characterized by short, cool summers and long, snowy winters.
The elevated vantage point near the Alpine Botanical Garden (Jardin Alpin du Mont Cenis) provides the best panoramic view of the lake's turquoise expanse.
Bring a windbreaker or layers, as the high-altitude winds can cause temperatures to drop rapidly even in summer.
Wear sturdy, waterproof hiking boots if you plan to navigate the rocky trails surrounding the shoreline.
Check local weather forecasts specifically for the Col du Mont Cenis pass, as conditions can differ significantly from the lower valleys.
Do not attempt to swim in the reservoir, as the water temperature is near freezing year-round and currents near the dam intake can be dangerous.
The access road to the lake is typically closed due to heavy snow from late autumn through late spring.
Stick to marked trails to protect the fragile alpine ecosystem and avoid picking wildflowers, which are often protected.
