It was created in 1986 as a reservoir for the Mavčiče Hydroelectric Plant by damming the Sava River.

[2] The lake, which belongs to the Municipalities of Šenčur, Kranj, and Medvode, covers an area of 1 square kilometre (0.39 sq mi) and is up to 17 metres (56 ft) deep.

A number of villages lie at the lake: from the south towards the north, they are Moše, Trboje and Žerjavka on the east side, and Mavčiče, Praše, and Jama on the west side.

[2] The lake is renowned by its fauna, which includes numerous fish (particularly carp) and about 140 species of birds.

[3] It is a rare and the biggest nesting place of the common merganser in Slovenia.