From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Orco (disambiguation).
Orco a rivarolo.jpg
The Orco near Rivarolo Canavese
Orco location within northern Italy
Origin Gran Paradiso
Mouth Po at Chivasso
Basin countries Italy
Length 89.568 km (55.655 mi)[1]
Source elevation about 2,600 m (8,500 ft)
Avg. discharge 23.9 m3/s (840 cu ft/s)[2]
Basin area 889.4 km2 (343.4 sq mi)[2]
Left tributaries Piantonetto, Eugio, Ribordone, Soana, Piova, Malesina
Right tributaries Gallenca

The Orco (Piedmontese: Eva d'òr, that is lit. Water of gold; Latin: Orgus[3]) is an Italian river. It originates in the Piedmontese slopes of Gran Paradiso and after about 90 kilometres (56 mi) reaches the Po river near Chivasso. Its drainage basin is home to the most important complex of hydropower in Piedmont, consisting of five dams: Agnel, Serrù, Ceresole, Piantonetto, Valsoera, and numerous turbines.

The Orco is known also for its gold-bearing sand, extracted already in antiquity. Even today there is a certain activity, on an amateur level, searching for grains of gold.[4]


  1. ^ Autorità di bacino del fiume Po
  2. ^ a b Caratterizzazione bacini Idrografici (elab.I.c/7) - Allegato tecnico al Piano di Tutela delle Acque, Regione Piemonte, rev. del 1º luglio 2004 (on-line in .pdf on [1])
  3. ^ Naturalis historia liber III - 118, Pliny the Elder, 77 d.C.
  4. ^ Oro nel fiume Orco a Feletto, www.minieredoro.it (accessdate: 7-6-2012)

Related articles[edit]

Coordinates: 45°10′N 7°52′E / 45.167°N 7.867°E / 45.167; 7.867