Pantà de Llauset, Reservoir in Montanuy, Ribagorza, Spain

Pantà de Llauset is a reservoir at 2200 m in the Llauset valley, Montanuy, formed by raising a glacial tarn with a dam finished in 1983. The dam stands 82 m high and 291 m long, holding 17 hm³ for hydroelectric production; the water surface covers 45 ha. It receives water from the Llauset river and the Botornàs tarn, and links to the Baserca reservoir through the reversible Moralets plant.

Llauset began as a glacial tarn that was artificially raised to form a reservoir, finished in 1983. Its 82-metre dam holds 17 hm³, used for hydroelectric production and linked with the Baserca reservoir through the reversible Moralets power station. The reservoir also receives water from the Botornàs tarn, about 1 km upstream.

The reservoir takes its name from the Llauset valley and river, and its water comes from the Llauset and from the Botornàs lake about 1 km upstream. It is a working hydroelectric site: water is exchanged with the Baserca reservoir through the reversible Moralets plant. Hikers pass the dam on the GR 11 route toward the Cap de Llauset refuge, about an hour and a half from the car park.

Summer months offer the best visiting conditions when weather is stable and trails are easy to walk. Parking is available near the dam, and you should bring water and warm clothing while sticking to marked trails, as mountain weather can change rapidly at this elevation.

The reservoir collects water from the Llauset river and from the Botornàs lake about 1 km upstream, and is linked to the Baserca reservoir through the reversible Moralets hydroelectric plant. The dam wall is 82 m high and 291 m long, holding back 17 hm³ at 2,200 m elevation.