The dam on the headwater of river Labe near the south edge of Špindlerův Mlýn. It was built up in the years 1910 - 1914. Its area is 40 ha and the length of reservoir about one kilometer. The dam is 41,5 m height and its length is 153,5 m. In the eighties the 120 length bridge with the highest pillar (30 m) was built across the reservoir.