This dam was built in the years 1976-1982 as a reservoir of drinkung water for Liberec and Jablonec nad Nisou. With its 43m height dam and area about 145 ha is it the highest and largest dam in the Jizera mountains. All area of the dam is protected and the swimming is prohibited. The dam is important place for recreation amd starting place of tourist paths to Jizera mountains.