Claim: Lago di Poschiavo, in the Swiss canton of Graubünden, was converted into a reservoir in the early 1900s to help feed the Campocologno power station.
Evidence: Lago di Poschiavo is a natural lake in the Val di Poschiavo in the Swiss canton of Graubünden. Between 1904 and 1907 the lake was converted into a reservoir as part of a series of hydro-electric power plants in the Val di Poschiavo that are fed from the Lago Bianco. Water arriving at the lake in the Poschiavino river has already passed through several plants, and water leaving the lake passes along a tunnel high along the western side of the valley and then down a pipeline to feed the Campocologno power station at Campocologno.