Lago della Vacca is an artificial lake in the Caffaro Valley in the Province of Brescia, Lombardy, Italy, west of Cornone di Blumone.

[1] The lake lies in a glacial basin at the southern end of the Adamello mountain range, surrounded by peaks exceeding 2,500 meters.

The lake has no real tributaries: it's supplied by the summer rainfall that falls in the drainage basin and by the melting of the snow covers the slopes of the surrounding mountains in the winter period between April and June.

The average volume of water contained in the reservoir is 2.4 million cubic meters.

The main use of the reservoir is the production of electricity: it feeds the underlying Gaver hydroelectric power plant.