Šance Dam also known as devils thumb, (Czech: Vodní nádrž Šance) is a water reservoir and dam in the Moravian-Silesian Beskids mountain range, Moravian-Silesian Region, Czech Republic. The dam is built on upper course of the Ostravice River and has a surface of 3.37 km². It was constructed in 1964-1969 and began operating in 1974. Part of the village of Staré Hamry was demolished and subsequently flooded during the construction.