Isorno (river)

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Isorno
The Isorno at Intragna

The Isorno at Intragna

Data
Water code CH : 71
location Italy

Switzerland

River system Po
Drain over Melezza  → Maggia  → Ticino  → Po  → Adria
source at Pizzo Medaro / Pizzo di Madei
46 ° 13 '42 "  N , 8 ° 28' 20"  O
Source height approx.  2280  m
muzzle at Intragna in the Melezza coordinates: 46 ° 10 '49 "  N , 8 ° 42' 25"  E ; CH1903:  697 932  /  115118 46 ° 10 '49 "  N , 8 ° 42' 25"  O
Mouth height 249  m
Height difference approx. 2031 m
Bottom slope approx. 85 ‰
length 23.9 km
Catchment area 146.7 km²
Left tributaries Ri d'in Erlöngh, Ribo , Cavüria, Bordione, Ri del Vo
Right tributaries Onsernone, Isornia, Riale Bura
Communities Onsernone , Isorno , Terre di Pedemonte , Centovalli
Isorno location map.jpg

The Isorno is a 24-kilometer-long river that has its source in the Italian region of Piedmont and flows into the Melezza from the left in the Swiss canton of Ticino . It flows through the Onsernone Valley and drains an area of ​​around 147 square kilometers.

course

The Isorno has its source at the Pizzo di Madéi border summit ( 2551  m above sea level ) and flows mainly in a south-easterly direction. It flows through the upper section of the Onsernone Valley, which is separated from the rest of Italy by mountains. It joins the Onsernone at Fondo Isorno , takes up the Rio Cortaccio at Alpe Fondo Monfraccio and is now called Rio dei Bagni according to the Swiss national map until it reaches the Swiss border a little later at the Bagni di Craveggia . Again as Isorno, it forms the state border between Italy and Switzerland over a length of about 470 meters. It then passes the villages of Spruga , Comologno , Corbella , Vocaglia , Crana and Russo , which are situated on the hillside above the river , where it receives the main tributary, Ribo . It continues to flow past Mosogno , Berzona and Loco . At Auressio it makes a bend towards the south and flows into the Melezza at Intragna , which flows into the Maggia a little later .

Dammed Isorno in the lower Onsernone Valley

Web links

Commons : Isorno  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d Geoserver of the Swiss Federal Administration ( information )