The Pioverna is a torrente (a stream whose flow is subject to a high level of seasonal variation) of Lombardy in northern Italy. The stream is born in the Grigna massif and flows north and west through the Valsassina, forming a gorge at Bellano before entering Lake Como. The entire course of the stream falls within the Province of Lecco.
The river is a seasonal habitat of several species of fish. The torrent, home to brown trout, rainbow trout and European bullhead, is a favourite of anglers.
An "extreme" flood occurred on 12 June 2019.
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