Étang de Soulcem is a large artificial lake in the Pyrenees mountains in Ariège, France. It is at an elevation of 1570 m and is used for hydroelectricity, generating 62 GWh/year. The lake, which has a surface area of 0.91 km2, was formed following the construction by Électricité de France of a dam across the northern end of the Vicdessos valley in 1980–1983.

Étang de Soulcem
LocationVicdessos valley, Ariège, France
Coordinates42°40′05″N 01°26′48″E / 42.66806°N 1.44667°E / 42.66806; 1.44667
Construction began1980
Opening date1983
Operator(s)Électricité de France
Dam and spillways
ImpoundsRousseau de Mounicou
Height66.50 m (218.2 ft)
Length275 m (902 ft)
Width (base)15 m (49 ft)
Reservoir
CreatesÉtang de Soulcem
Total capacity29,300,000 m3 (1.03×109 cu ft)
Catchment area44.3 km2 (17.1 sq mi)
Surface area0.91 km2 (0.35 sq mi)
Power Station
Hydraulic head409 m (1,342 ft) (via chutes to the Soulcem hydro plant)
Annual generation62 GWh/year
Average flow 7 m3/s
Peak flow 85 m3/s
Evacuation flow134 m3/s

The lake contains various fish including brown trout (S. trutta), Arctic char (S. alpinus), brook trout (S. fontinalis), and common minnow (P. phoxinus).

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