Lac de Roselend

Lac de Roselend
versgui · CC BY-SA 3.0 · source
Name	Lac de Roselend
Location	Beaufortain, Savoie, Auvergne-Rhône-Alpes, France
Coordinates	45°46′N 6°43′E
Type	Reservoir
Inflow	Durance? Arly? Beaufortain streams
Outflow	Isère? Dorons?
Basin countries	France
Area	1.54 km²
Volume	220 million m³
Elevation	1,550 m

Lac de Roselend is an alpine reservoir located in the Beaufortain massif of Savoie, Auvergne-Rhône-Alpes, France. The impoundment lies beneath glaciated ridges near the Beaufort, Arêches-Beaufort, and Bourg-Saint-Maurice regions and functions as both a hydroelectric storage basin and a scenic mountain landscape. Its setting links to prominent alpine transit routes such as the Col du Pré and to regional industries including hydropower companies and alpine agriculture.

Geography

The reservoir occupies a high-altitude basin in the Alps within proximity to the Massif du Beaufortain, the Vanoise National Park, and the Beaufortain Massif summits. Surrounding municipalities include Arêches-Beaufort, Beaufort (Savoie), and Megève while the nearest major transport hubs are Albertville and Chambéry. Topographically, the lake is framed by ridgelines connected to peaks such as the Rocher Blanc and the Pierra Menta, and drains toward valleys integrated with the Isère watershed and montane corridors used historically by Tarentaise shepherding routes.

Hydrology and Reservoir Characteristics

Formed by a masonry and concrete barrier, the basin stores runoff from alpine catchments including tributaries feeding the Arly and other Beaufortain torrents. Operating as a regulated reservoir, the facility modulates seasonal snowmelt and storm inflows to supply downstream hydroelectric plants operated by regional utilities and links into cascade schemes found across the Rhone–Alpes hydroelectric network. Its storage capacity and reservoir surface area influence local microclimates and snowpack retention; water-level drawdown patterns are managed for flood control, seasonal energy demand, and irrigation linked to agricultural zones like Tarentaise pastures and valley orchards.

History and Construction

The impoundment project was realized in the mid-20th century as part of postwar infrastructure expansion coordinated with national electrification policies and regional development plans involving state agencies and private firms active in the French Third Republic's later institutional legacy. Engineering works employed techniques contemporaneous with other Alpine dam projects such as those at Émosson and Gavarnie, and relied on labor and materials mobilized by contractors familiar with masonry gravity dams and concrete arch designs. Construction transformed traditional grazing commons and local land tenures associated with communes like Arêches-Beaufort and prompted negotiations with administrative entities in Savoie and regional planning authorities in Auvergne-Rhône-Alpes.

Ecology and Environment

The reservoir and its riparian zone intersect habitats typical of montane and subalpine environments influenced by alpine floras and faunas, including species associated with Vanoise biogeographic corridors. Aquatic communities reflect introductions and management for cold-water species common to regional lakes, and avifauna includes alpine-adapted birds that utilize shoreline mosaics for nesting. Environmental monitoring programs, often coordinated with regional conservation groups and municipal actors, assess impacts on sediment transport, water quality, and endemic plant communities; these efforts relate to broader conservation frameworks exemplified by Parc national de la Vanoise policies and national environmental legislation.

Tourism and Recreation

The reservoir serves as a focal point for alpine tourism tied to hiking, cycling, and sightseeing along panoramic routes connecting to attractions such as the Route des Grandes Alpes and local mountain huts serving trekkers bound for the GR5 and other long-distance trails. In summer, visitors access viewpoints near the dam and take advantage of interpretive panels detailing engineering heritage and regional culture tied to Beaufort cheese production. Winter and shoulder seasons attract snowshoeing and backcountry ski activities that engage guides certified by professional associations active in Chamonix and nearby alpine resorts.

Access and Infrastructure

Access is provided via departmental roads connecting to arterial routes linking Albertville and the Tarentaise Valley, with seasonal restrictions and avalanche-control measures enforced by municipal authorities. Facilities at the site include service roads for maintenance, visitor parking, and trailheads connecting to refuge networks and alpine guide services originating from communes like Beaufort (Savoie) and Arêches-Beaufort. Energy infrastructure integrates penstocks, switchyards, and transmission lines that tie into the regional grid managed by operators with links to national entities headquartered in Paris and regional administrative centers in Chambéry.

Cultural and Economic Significance

Beyond its role in power generation, the reservoir influences local economies rooted in pastoralism, artisanal food production such as Beaufort cheese dairies, and mountain tourism linked to nearby resorts like Les Arcs and La Plagne. Cultural narratives surrounding the lake intersect with alpine heritage conserved by local historical societies and municipal archives documenting transhumance, engineering milestones, and landscape change. Its presence factors into regional planning assessments involving economic development agencies and intercommunal cooperation frameworks aimed at balancing energy, heritage, and environmental stewardship.

Category:Lakes of Savoie Category:Reservoirs in France Category:Hydroelectricity in France