river_name = Tresa
Lake Luganobetween Ponte Tresaand Lavena Ponte Tresa
Lago Maggioreat Luino
length = 13 km
elevation = 295 m
mouth_elevation =c. 193 m
discharge = m³/s
watershed = km²
riverTresa leaves Lake Luganoat a point between Lavena Ponte Tresain Italy and Ponte Tresain Switzerland and flows into Lake Maggiorenear Luino, a few hundred meters after joining the Margorabbia. At the outflow from Lake Lugano the river is crossed by a bridge which unites the Swiss and Italian parts of Ponte Tresa; a customs post divides them.
The river is about 13 km long and for most of its course marks the boundary between the Italian
Province of Vareseand the Swiss canton Ticino. It passes through the Swiss communes of Ponte Tresa, Croglioand Monteggio, and the Italian communes of Lavena Ponte Tresa, Cremenagaand Luino.
A dam on the river, known as the Creva dam serves two purposes: to use the difference in altitude between the lakes to produce
hydropower, and as far as possible to regulate the flow of water into Lake Maggiore in order to avoid or limit the dangers of flooding.
* [http://www.hydrodaten.admin.ch/e/2167.htm Hydrological data of the Tresa] at
Wikimedia Foundation. 2010.